silverlight - 随后启动两个 WebClient.UploadStringAsync 调用

Question

当两次调用 WebClient.UploadStringAsync 时，没有等待 WebClient.UploadStringCompleted 事件，抛出以下异常:

“WebClient不支持并发I/O操作”

显然，这是不支持的。

之所以想要发起多个 HTTP POST 请求而不必等待之前的响应到达，是因为性能；我想避免往返延迟。是否有解决此限制的方法？

Answer 1

您需要使用多个 WebClient 实例。

 var wc1 = new WebClient();
 wc1.UploadStringCompleted += (s, args) => {
    // do stuff when first upload completes
 }
 wc1.UploadString(uri1,str1);

 var wc2 = new WebClient();
 wc2.UploadStringCompleted += (s, args) => {
    // do stuff when second upload completes
    // might happen before first has completed
 }
 wc2.UploadString(uri2,str2);