annotate Source/Data/Linq/CompiledQuery.cs @ 0:f990fcb411a9

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author cin
date Thu, 27 Mar 2014 21:46:09 +0400
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1 using System;
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2 using System.Collections.Generic;
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3 using System.Linq;
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4 using System.Linq.Expressions;
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5
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6 namespace BLToolkit.Data.Linq
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7 {
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8 using BLToolkit.Linq;
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9 using Reflection;
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10
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11 /// <summary>
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12 /// Provides for compilation and caching of queries for reuse.
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13 /// </summary>
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14 public class CompiledQuery
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15 {
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16 protected CompiledQuery(LambdaExpression query)
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17 {
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18 _query = query;
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19 }
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20
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21 readonly object _sync = new object();
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22 readonly LambdaExpression _query;
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23 volatile Func<object[],object> _compiledQuery;
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24
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25 TResult ExecuteQuery<TResult>(params object[] args)
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26 {
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27 if (_compiledQuery == null)
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28 lock (_sync)
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29 if (_compiledQuery == null)
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30 _compiledQuery = CompileQuery(_query);
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31
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32 return (TResult)_compiledQuery(args);
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33 }
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34
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35 private interface ITableHelper
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36 {
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37 Expression CallTable(LambdaExpression query, Expression expr, ParameterExpression ps, bool isQueriable);
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38 }
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39
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40 internal class TableHelper<T> : ITableHelper
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41 {
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42 public Expression CallTable(LambdaExpression query, Expression expr, ParameterExpression ps, bool isQueriable)
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43 {
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44 var table = new CompiledTable<T>(query, expr);
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45
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46 return Expression.Call(
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47 Expression.Constant(table),
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48 isQueriable ?
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49 ReflectionHelper.Expressor<CompiledTable<T>>.MethodExpressor(t => t.Create (null)) :
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50 ReflectionHelper.Expressor<CompiledTable<T>>.MethodExpressor(t => t.Execute(null)),
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51 ps);
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52 }
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53 }
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54
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55 static Func<object[],object> CompileQuery(LambdaExpression query)
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56 {
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57 var ps = Expression.Parameter(typeof(object[]), "ps");
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58
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59 var info = query.Body.Convert(pi =>
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60 {
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61 switch (pi.NodeType)
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62 {
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63 case ExpressionType.Parameter :
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64 {
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65 var idx = query.Parameters.IndexOf((ParameterExpression)pi);
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66
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67 if (idx >= 0)
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68 return Expression.Convert(Expression.ArrayIndex(ps, Expression.Constant(idx)), pi.Type);
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69
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70 break;
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71 }
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72
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73 case ExpressionType.Call :
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74 {
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75 var expr = (MethodCallExpression)pi;
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76
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77 if (expr.IsQueryable())
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78 {
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79 var qtype = TypeHelper.GetGenericType(
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80 TypeHelper.IsSameOrParent(typeof(IQueryable), expr.Type) ?
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81 typeof(IQueryable<>) :
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82 typeof(IEnumerable<>),
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83 expr.Type);
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84
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85 var helper = (ITableHelper)Activator.CreateInstance(
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86 typeof(TableHelper<>).MakeGenericType(qtype == null ? expr.Type : qtype.GetGenericArguments()[0]));
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87
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88 return helper.CallTable(query, expr, ps, qtype != null);
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89 }
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90
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91 if (expr.Method.Name == "GetTable" && expr.Method.DeclaringType == typeof(Extensions))
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92 goto case ExpressionType.MemberAccess;
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93 }
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94
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95 break;
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96
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97 case ExpressionType.MemberAccess :
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98 if (pi.Type.IsGenericType && pi.Type.GetGenericTypeDefinition() == typeof(Table<>))
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99 {
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100 var helper = (ITableHelper)Activator
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101 .CreateInstance(typeof(TableHelper<>)
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102 .MakeGenericType(pi.Type.GetGenericArguments()[0]));
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103 return helper.CallTable(query, pi, ps, true);
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104 }
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105
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106 break;
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107 }
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108
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109 return pi;
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110 });
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111
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112 return Expression.Lambda<Func<object[],object>>(Expression.Convert(info, typeof(object)), ps).Compile();
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113 }
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114
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115 #region Invoke
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116
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117 public TResult Invoke<TDC,TResult>(TDC dataContext)
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118 {
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119 return ExecuteQuery<TResult>(dataContext);
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120 }
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121
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122 public TResult Invoke<TDC,T1,TResult>(TDC dataContext, T1 arg1)
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123 {
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124 return ExecuteQuery<TResult>(dataContext, arg1);
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125 }
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126
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127 public TResult Invoke<TDC,T1,T2,TResult>(TDC dataContext, T1 arg1, T2 arg2)
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128 {
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129 return ExecuteQuery<TResult>(dataContext, arg1, arg2);
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130 }
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131
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132 public TResult Invoke<TDC,T1,T2,T3,TResult>(TDC dataContext, T1 arg1, T2 arg2, T3 arg3)
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133 {
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134 return ExecuteQuery<TResult>(dataContext, arg1, arg2, arg3);
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135 }
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136
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137 public TResult Invoke<TDC,T1,T2,T3,T4,TResult>(TDC dataContext, T1 arg1, T2 arg2, T3 arg3, T4 arg4)
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138 {
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139 return ExecuteQuery<TResult>(dataContext, arg1, arg2, arg3, arg4);
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140 }
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141
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142 public TResult Invoke<TDC,T1,T2,T3,T4,T5,TResult>(TDC dataContext, T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5)
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143 {
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144 return ExecuteQuery<TResult>(dataContext, arg1, arg2, arg3, arg4, arg5);
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145 }
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146
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147 #endregion
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148
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149 #region Compile
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150
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151 /// <summary>
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152 /// Compiles the query.
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153 /// </summary>
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154 /// <returns>
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155 /// A generic delegate that represents the compiled query.
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156 /// </returns>
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157 /// <param name="query">
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158 /// The query expression to be compiled.
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159 /// </param>
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160 /// <typeparam name="TDC ">
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161 /// Represents the type of the parameter that has to be passed in when executing the delegate returned by the method.
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162 /// </typeparam>
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163 /// <typeparam name="TResult">
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164 /// Returned type of the delegate returned by the method.
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165 /// </typeparam>
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166 public static Func<TDC,TResult> Compile<TDC,TResult>(
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167 [JetBrains.Annotations.NotNull] Expression<Func<TDC,TResult>> query)
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168 where TDC : IDataContext
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169 {
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170 if (query == null) throw new ArgumentNullException("query");
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171 return new CompiledQuery(query).Invoke<TDC,TResult>;
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172 }
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173
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174 /// <summary>
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175 /// Compiles the query.
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176 /// </summary>
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177 /// <returns>
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178 /// A generic delegate that represents the compiled query.
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179 /// </returns>
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180 /// <param name="query">
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181 /// The query expression to be compiled.
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182 /// </param>
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183 /// <typeparam name="TDC">
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184 /// Represents the type of the parameter that has to be passed in when executing the delegate returned by the method.
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185 /// </typeparam>
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186 /// <typeparam name="TArg1">
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187 /// Represents the type of the parameter that has to be passed in when executing the delegate returned by the method.
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188 /// </typeparam>
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189 /// <typeparam name="TResult">
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190 /// Returned type of the delegate returned by the method.
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191 /// </typeparam>
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192 public static Func<TDC,TArg1,TResult> Compile<TDC,TArg1,TResult>(
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193 [JetBrains.Annotations.NotNull] Expression<Func<TDC,TArg1,TResult>> query)
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194 where TDC : IDataContext
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195 {
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196 if (query == null) throw new ArgumentNullException("query");
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197 return new CompiledQuery(query).Invoke<TDC,TArg1,TResult>;
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198 }
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199
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200 /// <summary>
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201 /// Compiles the query.
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202 /// </summary>
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203 /// <returns>
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204 /// A generic delegate that represents the compiled query.
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205 /// </returns>
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206 /// <param name="query">
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207 /// The query expression to be compiled.
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208 /// </param>
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209 /// <typeparam name="TDC ">
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210 /// Represents the type of the parameter that has to be passed in when executing the delegate returned by the method.
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211 /// </typeparam>
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212 /// <typeparam name="TArg1">
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213 /// Represents the type of the parameter that has to be passed in when executing the delegate returned by the method.
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214 /// </typeparam>
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215 /// <typeparam name="TArg2">
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216 /// Represents the type of the parameter that has to be passed in when executing the delegate returned by the method.
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217 /// </typeparam>
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218 /// <typeparam name="TResult">
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219 /// Returned type of the delegate returned by the method.
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220 /// </typeparam>
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221 public static Func<TDC,TArg1,TArg2,TResult> Compile<TDC,TArg1,TArg2,TResult>(
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222 [JetBrains.Annotations.NotNull] Expression<Func<TDC,TArg1,TArg2,TResult>> query)
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223 where TDC : IDataContext
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224 {
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225 if (query == null) throw new ArgumentNullException("query");
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226 return new CompiledQuery(query).Invoke<TDC,TArg1,TArg2,TResult>;
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227 }
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228
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229 /// <summary>
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230 /// Compiles the query.
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231 /// </summary>
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232 /// <returns>
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233 /// A generic delegate that represents the compiled query.
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234 /// </returns>
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235 /// <param name="query">
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236 /// The query expression to be compiled.
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237 /// </param>
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238 /// <typeparam name="TDC ">
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239 /// Represents the type of the parameter that has to be passed in when executing the delegate returned by the method.
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240 /// </typeparam>
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241 /// <typeparam name="TArg1">
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242 /// Represents the type of the parameter that has to be passed in when executing the delegate returned by the method.
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243 /// </typeparam>
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244 /// <typeparam name="TArg2">
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245 /// Represents the type of the parameter that has to be passed in when executing the delegate returned by the method.
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246 /// </typeparam>
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247 /// <typeparam name="TArg3">
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248 /// Represents the type of the parameter that has to be passed in when executing the delegate returned by the method.
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249 /// </typeparam>
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250 /// <typeparam name="TResult">
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251 /// Returned type of the delegate returned by the method.
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252 /// </typeparam>
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253 public static Func<TDC,TArg1,TArg2,TArg3,TResult> Compile<TDC,TArg1,TArg2,TArg3,TResult>(
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254 [JetBrains.Annotations.NotNull] Expression<Func<TDC,TArg1,TArg2,TArg3,TResult>> query)
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255 where TDC : IDataContext
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256 {
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257 if (query == null) throw new ArgumentNullException("query");
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258 return new CompiledQuery(query).Invoke<TDC,TArg1,TArg2,TArg3,TResult>;
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259 }
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260
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261 /// <summary>
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262 /// Compiles the query.
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263 /// </summary>
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264 /// <returns>
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265 /// A generic delegate that represents the compiled query.
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266 /// </returns>
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267 /// <param name="query">
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268 /// The query expression to be compiled.
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269 /// </param>
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270 /// <typeparam name="TDC ">
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271 /// Represents the type of the parameter that has to be passed in when executing the delegate returned by the method.
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272 /// </typeparam>
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273 /// <typeparam name="TArg1">
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274 /// Represents the type of the parameter that has to be passed in when executing the delegate returned by the method.
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275 /// </typeparam>
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276 /// <typeparam name="TArg2">
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277 /// Represents the type of the parameter that has to be passed in when executing the delegate returned by the method.
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278 /// </typeparam>
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279 /// <typeparam name="TArg3">
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280 /// Represents the type of the parameter that has to be passed in when executing the delegate returned by the method.
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281 /// </typeparam>
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282 /// <typeparam name="TArg4">
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283 /// Represents the type of the parameter that has to be passed in when executing the delegate returned by the method.
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284 /// </typeparam>
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285 /// <typeparam name="TResult">
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286 /// Returned type of the delegate returned by the method.
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287 /// </typeparam>
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288 public static Func<TDC,TArg1,TArg2,TArg3,TArg4,TResult> Compile<TDC,TArg1,TArg2,TArg3,TArg4,TResult>(
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289 [JetBrains.Annotations.NotNull] Expression<Func<TDC,TArg1,TArg2,TArg3,TArg4,TResult>> query)
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290 where TDC : IDataContext
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291 {
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292 if (query == null) throw new ArgumentNullException("query");
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293 return new CompiledQuery(query).Invoke<TDC,TArg1,TArg2,TArg3,TArg4,TResult>;
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294 }
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295
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296 /// <summary>
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297 /// Compiles the query.
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298 /// </summary>
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299 /// <returns>
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300 /// A generic delegate that represents the compiled query.
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301 /// </returns>
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302 /// <param name="query">
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303 /// The query expression to be compiled.
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304 /// </param>
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305 /// <typeparam name="TDC ">
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306 /// Represents the type of the parameter that has to be passed in when executing the delegate returned by the method.
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307 /// </typeparam>
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308 /// <typeparam name="TArg1">
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309 /// Represents the type of the parameter that has to be passed in when executing the delegate returned by the method.
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310 /// </typeparam>
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311 /// <typeparam name="TArg2">
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312 /// Represents the type of the parameter that has to be passed in when executing the delegate returned by the method.
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313 /// </typeparam>
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314 /// <typeparam name="TArg3">
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315 /// Represents the type of the parameter that has to be passed in when executing the delegate returned by the method.
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316 /// </typeparam>
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317 /// <typeparam name="TArg4">
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318 /// Represents the type of the parameter that has to be passed in when executing the delegate returned by the method.
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319 /// </typeparam>
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320 /// <typeparam name="TArg5">
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321 /// Represents the type of the parameter that has to be passed in when executing the delegate returned by the method.
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322 /// </typeparam>
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323 /// <typeparam name="TResult">
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324 /// Returned type of the delegate returned by the method.
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325 /// </typeparam>
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326 public static Func<TDC,TArg1,TArg2,TArg3,TArg4,TArg5,TResult> Compile<TDC,TArg1,TArg2,TArg3,TArg4,TArg5,TResult>(
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327 [JetBrains.Annotations.NotNull] Expression<Func<TDC,TArg1,TArg2,TArg3,TArg4,TArg5,TResult>> query)
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328 where TDC : IDataContext
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329 {
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330 if (query == null) throw new ArgumentNullException("query");
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331 return new CompiledQuery(query).Invoke<TDC,TArg1,TArg2,TArg3,TArg4,TArg5,TResult>;
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332 }
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333
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334 #endregion
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335 }
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336 }