我正在尝试与一个我无法控制的系统进行通信,但是其中一个方法需要一个HttpPostedFile在我的代码中,我有一个字节数组.有谁有一个例子来实例化一个HttpPostedFile,因为我知道它的构造函数是内部的？
我发现最好的是this SO post,它使用反射,但是他们被引导到另一个方向,我不能采取,因为我无法修改第三方系统方法签名.
解决方法
这真的是真的hacky代码,但以下似乎适用于我：
public HttpPostedFile ConstructHttpPostedFile(byte[] data,string filename,string contentType) {
// Get the System.Web assembly reference
Assembly systemWebAssembly = typeof (HttpPostedFileBase).Assembly;
// Get the types of the two internal types we need
Type typeHttpRawUploadedContent = systemWebAssembly.GetType("System.Web.HttpRawUploadedContent");
Type typeHttpInputStream = systemWebAssembly.GetType("System.Web.HttpInputStream");
// Prepare the signatures of the constructors we want.
Type[] uploadedParams = { typeof(int),typeof(int) };
Type[] streamParams = {typeHttpRawUploadedContent,typeof (int),typeof (int)};
Type[] parameters = { typeof(string),typeof(string),typeHttpInputStream };
// Create an HttpRawUploadedContent instance
object uploadedContent = typeHttpRawUploadedContent
.GetConstructor(BindingFlags.NonPublic | BindingFlags.Instance,null,uploadedParams,null)
.Invoke(new object[]{data.Length,data.Length});
// Call the AddBytes method
typeHttpRawUploadedContent
.GetMethod("AddBytes",BindingFlags.NonPublic | BindingFlags.Instance)
.Invoke(uploadedContent,new object[] {data,data.Length});
// This is necessary if you will be using the returned content (ie to Save)
typeHttpRawUploadedContent
.GetMethod("DoneAddingBytes",null);
// Create an HttpInputStream instance
object stream = (Stream)typeHttpInputStream
.GetConstructor(BindingFlags.NonPublic | BindingFlags.Instance,streamParams,null)
.Invoke(new object[] {uploadedContent,data.Length});
// Create an HttpPostedFile instance
HttpPostedFile postedFile = (HttpPostedFile)typeof(HttpPostedFile)
.GetConstructor(BindingFlags.NonPublic | BindingFlags.Instance,parameters,null)
.Invoke(new object[] {filename,contentType,stream});
return postedFile;
}
