另一种方法是对 HttpRequest 使用 .Net 解析器。为此，您需要为 WorkerRequest 使用一些反射和简单的类。
首先创建派生自 HttpWorkerRequest 的类（为简单起见，您可以使用 SimpleWorkerRequest）：
public class MyWorkerRequest : SimpleWorkerRequest
{
private readonly string _size;
private readonly Stream _data;
private string _contentType;
public MyWorkerRequest(Stream data, string size, string contentType)
: base("/app", @"c:\", "aa", "", null)
{
_size = size ?? data.Length.ToString(CultureInfo.InvariantCulture);
_data = data;
_contentType = contentType;
}
public override string GetKnownRequestHeader(int index)
{
switch (index)
{
case (int)HttpRequestHeader.ContentLength:
return _size;
case (int)HttpRequestHeader.ContentType:
return _contentType;
}
return base.GetKnownRequestHeader(index);
}
public override int ReadEntityBody(byte[] buffer, int offset, int size)
{
return _data.Read(buffer, offset, size);
}
public override int ReadEntityBody(byte[] buffer, int size)
{
return ReadEntityBody(buffer, 0, size);
}
}
然后，无论您在哪里创建消息流并创建此类的实例。我在 WCF 服务中这样做：
[WebInvoke(Method = "POST",
ResponseFormat = WebMessageFormat.Json,
BodyStyle = WebMessageBodyStyle.Bare)]
public string Upload(Stream data)
{
HttpWorkerRequest workerRequest =
new MyWorkerRequest(data,
WebOperationContext.Current.IncomingRequest.ContentLength.
ToString(CultureInfo.InvariantCulture),
WebOperationContext.Current.IncomingRequest.ContentType
);
然后使用激活器和非公共构造函数创建 HttpRequest
var r = (HttpRequest)Activator.CreateInstance(
typeof(HttpRequest),
BindingFlags.Instance | BindingFlags.NonPublic,
null,
new object[]
{
workerRequest,
new HttpContext(workerRequest)
},
null);
var runtimeField = typeof (HttpRuntime).GetField("_theRuntime", BindingFlags.Static | BindingFlags.NonPublic);
if (runtimeField == null)
{
return;
}
var runtime = (HttpRuntime) runtimeField.GetValue(null);
if (runtime == null)
{
return;
}
var codeGenDirField = typeof(HttpRuntime).GetField("_codegenDir", BindingFlags.Instance | BindingFlags.NonPublic);
if (codeGenDirField == null)
{
return;
}
codeGenDirField.SetValue(runtime, @"C:\MultipartTemp");
在r.Files 之后，您将获得流中的文件。