CefSharp v62修改,支持.net4.0

吐槽一下,博客园久了没有上,账号没了,重新申请一个.

    cesharp v62版本,内核采用最新的Cef 62,支持最新的Grid布局. 由于官方的cefsharp 采用.net4.5.2开发.怎么办怎么办.我只能用.net4.0.没办法啊,自己拿源码修改兼容呗.

    仔细分析源码发现:

     1.net4.5.2 引入了 async/await 关键字. 这个其实国外大神已经有源码放出来了,我们把代码直接引入cefsharp 这个工程. 就可以直接在4.0里使用 async/await;

     2.net4.5 对task api 做了扩展, 我们只需要在.net4.0实现一下对应的api.就可以了.

    3. 源码里面用了很多4.5才有的GetTypeInfo      扩展方法错误. 它返回的类型是typeinfo,不用管它,把GetTypeInfo      删掉. 直接Type  调用就可以了.

    4. 对Task静态方法的扩展,需要修改一下,静态方法的调用方式.

以上是要点.下面贴源码:

本段源码是对:async/await的支持:

  1 namespace System.Threading.Tasks
  2 {
  3     public static class TaskEx
  4     {
  5         public static TaskAwaiter GetAwaiter(this Task task)
  6         {
  7             return new TaskAwaiter(task);
  8         }
  9 
 10         public static TaskAwaiter<T> GetAwaiter<T>(this Task<T> task)
 11         {
 12             return new TaskAwaiter<T>(task);
 13         }
 14     }
 15 
 16     public struct TaskAwaiter : INotifyCompletion
 17     {
 18         readonly Task task;
 19 
 20         internal TaskAwaiter(Task task)
 21         {
 22             this.task = task;
 23         }
 24 
 25         internal static TaskScheduler TaskScheduler
 26         {
 27             get
 28             {
 29                 if (SynchronizationContext.Current == null)
 30                     return TaskScheduler.Default;
 31                 else
 32                     return TaskScheduler.FromCurrentSynchronizationContext();
 33             }
 34         }
 35 
 36         public bool IsCompleted
 37         {
 38             get { return task.IsCompleted; }
 39         }
 40 
 41         public void OnCompleted(Action continuation)
 42         {
 43             this.task.ContinueWith(
 44                 delegate (Task task) {
 45                     continuation();
 46                 }, TaskAwaiter.TaskScheduler);
 47         }
 48 
 49         public void GetResult()
 50         {
 51             try
 52             {
 53                 task.Wait();
 54             }
 55             catch (AggregateException ex)
 56             {
 57                 throw ex.InnerExceptions[0];
 58             }
 59         }
 60     }
 61 
 62     public struct TaskAwaiter<T> : INotifyCompletion
 63     {
 64         readonly Task<T> task;
 65 
 66         internal TaskAwaiter(Task<T> task)
 67         {
 68             this.task = task;
 69         }
 70 
 71         public bool IsCompleted
 72         {
 73             get { return task.IsCompleted; }
 74         }
 75 
 76         public void OnCompleted(Action continuation)
 77         {
 78             this.task.ContinueWith(
 79                 delegate (Task<T> task) {
 80                     continuation();
 81                 }, TaskAwaiter.TaskScheduler);
 82         }
 83 
 84         public T GetResult()
 85         {
 86             try
 87             {
 88                 return task.Result;
 89             }
 90             catch (AggregateException ex)
 91             {
 92                 throw ex.InnerExceptions[0];
 93             }
 94         }
 95     }
 96 }
 97 
 98 namespace System.Runtime.CompilerServices
 99 {
100     public interface INotifyCompletion
101     {
102         void OnCompleted(Action continuation);
103     }
104 
105     public interface ICriticalNotifyCompletion : INotifyCompletion
106     {
107         [SecurityCritical]
108         void UnsafeOnCompleted(Action continuation);
109     }
110 
111     public interface IAsyncStateMachine
112     {
113         void MoveNext();
114         void SetStateMachine(IAsyncStateMachine stateMachine);
115     }
116 
117     public struct AsyncVoidMethodBuilder
118     {
119         public static AsyncVoidMethodBuilder Create()
120         {
121             return new AsyncVoidMethodBuilder();
122         }
123 
124         public void SetException(Exception exception)
125         {
126             throw exception;
127         }
128 
129         public void SetResult()
130         {
131         }
132 
133         public void SetStateMachine(IAsyncStateMachine stateMachine)
134         {
135             // Should not get called as we don't implement the optimization that this method is used for.
136             throw new NotImplementedException();
137         }
138 
139         public void Start<TStateMachine>(ref TStateMachine stateMachine) where TStateMachine : IAsyncStateMachine
140         {
141             stateMachine.MoveNext();
142         }
143 
144         public void AwaitOnCompleted<TAwaiter, TStateMachine>(ref TAwaiter awaiter, ref TStateMachine stateMachine) where TAwaiter : INotifyCompletion where TStateMachine : IAsyncStateMachine
145         {
146             awaiter.OnCompleted(stateMachine.MoveNext);
147         }
148 
149         public void AwaitUnsafeOnCompleted<TAwaiter, TStateMachine>(ref TAwaiter awaiter, ref TStateMachine stateMachine) where TAwaiter : ICriticalNotifyCompletion where TStateMachine : IAsyncStateMachine
150         {
151             awaiter.OnCompleted(stateMachine.MoveNext);
152         }
153     }
154 
155     public struct AsyncTaskMethodBuilder
156     {
157         TaskCompletionSource<object> tcs;
158 
159         public Task Task { get { return tcs.Task; } }
160 
161         public static AsyncTaskMethodBuilder Create()
162         {
163             AsyncTaskMethodBuilder b;
164             b.tcs = new TaskCompletionSource<object>();
165             return b;
166         }
167 
168         public void Start<TStateMachine>(ref TStateMachine stateMachine) where TStateMachine : IAsyncStateMachine
169         {
170             stateMachine.MoveNext();
171         }
172 
173         public void SetStateMachine(IAsyncStateMachine stateMachine)
174         {
175             // Should not get called as we don't implement the optimization that this method is used for.
176             throw new NotImplementedException();
177         }
178 
179         public void AwaitOnCompleted<TAwaiter, TStateMachine>(ref TAwaiter awaiter, ref TStateMachine stateMachine) where TAwaiter : INotifyCompletion where TStateMachine : IAsyncStateMachine
180         {
181             awaiter.OnCompleted(stateMachine.MoveNext);
182         }
183 
184         public void AwaitUnsafeOnCompleted<TAwaiter, TStateMachine>(ref TAwaiter awaiter, ref TStateMachine stateMachine) where TAwaiter : ICriticalNotifyCompletion where TStateMachine : IAsyncStateMachine
185         {
186             awaiter.OnCompleted(stateMachine.MoveNext);
187         }
188 
189         public void SetResult()
190         {
191             tcs.SetResult(null);
192         }
193 
194         public void SetException(Exception exception)
195         {
196             tcs.SetException(exception);
197         }
198     }
199 
200     public struct AsyncTaskMethodBuilder<T>
201     {
202         TaskCompletionSource<T> tcs;
203 
204         public Task<T> Task { get { return tcs.Task; } }
205 
206         public static AsyncTaskMethodBuilder<T> Create()
207         {
208             AsyncTaskMethodBuilder<T> b;
209             b.tcs = new TaskCompletionSource<T>();
210             return b;
211         }
212 
213         public void Start<TStateMachine>(ref TStateMachine stateMachine) where TStateMachine : IAsyncStateMachine
214         {
215             stateMachine.MoveNext();
216         }
217 
218         public void SetStateMachine(IAsyncStateMachine stateMachine)
219         {
220             // Should not get called as we don't implement the optimization that this method is used for.
221             throw new NotImplementedException();
222         }
223 
224         public void AwaitOnCompleted<TAwaiter, TStateMachine>(ref TAwaiter awaiter, ref TStateMachine stateMachine) where TAwaiter : INotifyCompletion where TStateMachine : IAsyncStateMachine
225         {
226             awaiter.OnCompleted(stateMachine.MoveNext);
227         }
228 
229         public void AwaitUnsafeOnCompleted<TAwaiter, TStateMachine>(ref TAwaiter awaiter, ref TStateMachine stateMachine) where TAwaiter : ICriticalNotifyCompletion where TStateMachine : IAsyncStateMachine
230         {
231             AwaitOnCompleted(ref awaiter, ref stateMachine);
232         }
233 
234         public void SetResult(T result)
235         {
236             tcs.SetResult(result);
237         }
238 
239         public void SetException(Exception exception)
240         {
241             tcs.SetException(exception);
242         }
243     }
244 }
hda37210

这段是对 Task 的扩展

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using System.Threading;
 6 using System.Threading.Tasks;
 7 
 8 namespace CefSharp
 9 {
10    public class TaskEx
11     {
12         public static Task<T> FromResult<T>(T t)
13         {
14             return Task.Factory.StartNew<T>(() => t);
15         }
16         public static Task Run(Action action)
17         {
18             var tcs = new TaskCompletionSource<object>();
19             new Thread(() => {
20                     try
21                     {
22                         action();
23                         tcs.SetResult(null);
24                     }
25                     catch (Exception ex)
26                     {
27                         tcs.SetException(ex);
28                     }
29                 })
30                 { IsBackground = true }.Start();
31             return tcs.Task;
32         }
33         public static Task<TResult> Run<TResult>(Func<TResult> function)
34         {
35             var tcs = new TaskCompletionSource<TResult>();
36             new Thread(() =>
37                 {
38                     try
39                     {
40                         tcs.SetResult(function());
41                     }
42                     catch (Exception ex)
43                     {
44                         tcs.SetException(ex);
45                     }
46                 })
47                 { IsBackground = true }.Start();
48             return tcs.Task;
49         }
50         public static Task Delay(int milliseconds)
51         {
52             var tcs = new TaskCompletionSource<object>();
53             var timer = new System.Timers.Timer(milliseconds) { AutoReset = false };
54             timer.Elapsed += delegate { timer.Dispose(); tcs.SetResult(null); };
55             timer.Start();
56             return tcs.Task;
57         }
58     }
59 }
hda37210

把在C#内添加以上代码里, 遇到 Task.Run 的时候,替换成 TaskEx.Run,遇到 Task.Delay 替换为TaskEx.Delay.

还有报 GetTypeInfo 这个错误的地方,删之就Ok了,

祝您顺利!

posted on 2017-12-18 13:06  不不不不  阅读(4460)  评论(3)  编辑  收藏  举报

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