Mercurial > pub > bltoolkit

comparison Source/Data/Linq/Builder/WhereBuilder.cs @ 0:f990fcb411a9

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Копия текущей версии из github
author cin
date Thu, 27 Mar 2014 21:46:09 +0400
parents
children
comparison
equal deleted inserted replaced
-1:000000000000 0:f990fcb411a9
1 using System;
2 using System.Linq.Expressions;
3
4 namespace BLToolkit.Data.Linq.Builder
5 {
6 using BLToolkit.Linq;
7
8 class WhereBuilder : MethodCallBuilder
9 {
10 protected override bool CanBuildMethodCall(ExpressionBuilder builder, MethodCallExpression methodCall, BuildInfo buildInfo)
11 {
12 return methodCall.IsQueryable("Where");
13 }
14
15 protected override IBuildContext BuildMethodCall(ExpressionBuilder builder, MethodCallExpression methodCall, BuildInfo buildInfo)
16 {
17 var sequence = builder.BuildSequence(new BuildInfo(buildInfo, methodCall.Arguments[0]));
18 var condition = (LambdaExpression)methodCall.Arguments[1].Unwrap();
19 var result = builder.BuildWhere(buildInfo.Parent, sequence, condition, true);
20
21 result.SetAlias(condition.Parameters[0].Name);
22
23 return result;
24 }
25
26 protected override SequenceConvertInfo Convert(
27 ExpressionBuilder builder, MethodCallExpression methodCall, BuildInfo buildInfo, ParameterExpression param)
28 {
29 var predicate = (LambdaExpression)methodCall.Arguments[1].Unwrap();
30 var info = builder.ConvertSequence(new BuildInfo(buildInfo, methodCall.Arguments[0]), predicate.Parameters[0]);
31
32 if (info != null)
33 {
34 info.Expression = methodCall.Convert(ex => ConvertMethod(methodCall, 0, info, predicate.Parameters[0], ex));
35
36 if (param != null)
37 {
38 if (param.Type != info.Parameter.Type)
39 param = Expression.Parameter(info.Parameter.Type, param.Name);
40
41 if (info.ExpressionsToReplace != null)
42 foreach (var path in info.ExpressionsToReplace)
43 {
44 path.Path = path.Path.Convert(e => e == info.Parameter ? param : e);
45 path.Expr = path.Expr.Convert(e => e == info.Parameter ? param : e);
46 }
47 }
48
49 info.Parameter = param;
50
51 return info;
52 }
53
54 return null;
55 }
56 }
57 }