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
      
        GetAwaiter
       
        (this Task
        
          task) 11         { 12             return new TaskAwaiter
         
          (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
          
            : INotifyCompletion 63     { 64         readonly Task
           
             task; 65 66 internal TaskAwaiter(Task
            
              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
             
               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 INotifyCompletion101 {102 void OnCompleted(Action continuation);103 }104 105 public interface ICriticalNotifyCompletion : INotifyCompletion106 {107 [SecurityCritical]108 void UnsafeOnCompleted(Action continuation);109 }110 111 public interface IAsyncStateMachine112 {113 void MoveNext();114 void SetStateMachine(IAsyncStateMachine stateMachine);115 }116 117 public struct AsyncVoidMethodBuilder118 {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
              
               (ref TStateMachine stateMachine) where TStateMachine : IAsyncStateMachine140 {141 stateMachine.MoveNext();142 }143 144 public void AwaitOnCompleted
               
                (ref TAwaiter awaiter, ref TStateMachine stateMachine) where TAwaiter : INotifyCompletion where TStateMachine : IAsyncStateMachine145 {146 awaiter.OnCompleted(stateMachine.MoveNext);147 }148 149 public void AwaitUnsafeOnCompleted
                
                 (ref TAwaiter awaiter, ref TStateMachine stateMachine) where TAwaiter : ICriticalNotifyCompletion where TStateMachine : IAsyncStateMachine150 {151 awaiter.OnCompleted(stateMachine.MoveNext);152 }153 }154 155 public struct AsyncTaskMethodBuilder156 {157 TaskCompletionSource
                 
                
               
              
             
            
           
          
         
        
       
      

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 TaskEx11     {12         public static Task
      
        FromResult
       
        (T t)13         {14             return Task.Factory.StartNew
        
         (() => t);15         }16         public static Task Run(Action action)17         {18             var tcs = new TaskCompletionSource
         
        
       
      

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!