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comparison Source/Data/Linq/QueryContext.cs @ 0:f990fcb411a9

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Копия текущей версии из github
author cin
date Thu, 27 Mar 2014 21:46:09 +0400
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-1:000000000000 0:f990fcb411a9
1 using System;
2 using System.Collections.Generic;
3 using System.Linq.Expressions;
4
5 namespace BLToolkit.Data.Linq
6 {
7 public class QueryContext
8 {
9 public class DataContextContext
10 {
11 public IDataContextInfo DataContextInfo;
12 public bool InUse;
13 }
14
15 public QueryContext(IDataContextInfo dataContext, Expression expr, object[] compiledParameters)
16 {
17 RootDataContext = dataContext;
18 Expression = expr;
19 CompiledParameters = compiledParameters;
20 }
21
22 public IDataContextInfo RootDataContext;
23 public Expression Expression;
24 public object[] CompiledParameters;
25 public int Counter;
26
27 List<DataContextContext> _contexts;
28
29 public DataContextContext GetDataContext()
30 {
31 if (_contexts == null)
32 {
33 RootDataContext.DataContext.OnClosing += OnRootClosing;
34 _contexts = new List<DataContextContext>(1);
35 }
36
37 foreach (var context in _contexts)
38 {
39 if (!context.InUse)
40 {
41 context.InUse = true;
42 return context;
43 }
44 }
45
46 var ctx = new DataContextContext { DataContextInfo = RootDataContext.Clone(true), InUse = true };
47
48 _contexts.Add(ctx);
49
50 return ctx;
51 }
52
53 public void ReleaseDataContext(DataContextContext context)
54 {
55 context.InUse = false;
56 }
57
58 void OnRootClosing(object sender, EventArgs e)
59 {
60 foreach (var context in _contexts)
61 context.DataContextInfo.DataContext.Dispose();
62
63 RootDataContext.DataContext.OnClosing -= OnRootClosing;
64
65 _contexts = null;
66 }
67
68 public void AfterQuery()
69 {
70 Counter++;
71 }
72 }
73 }