我正在尝试与我无法控制的系统进行通信,但是它的一种方法采用 HttpPostedFile 在我的代码中我有一个字节数组。有没有人有实例化 HttpPostedFile 的例子,因为我知道它的构造函数是内部的?
我找到的最好的是 Creating an instance of HttpPostedFile with Reflection它使用反射,但是它们被引导到另一个我不能接受的方向,因为我无法修改第三方系统方法签名。
最佳答案
这真的是非常 hacky 代码,但以下似乎对我有用:
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, 0, data.Length});
// This is necessary if you will be using the returned content (ie to Save)
typeHttpRawUploadedContent
.GetMethod("DoneAddingBytes", BindingFlags.NonPublic | BindingFlags.Instance)
.Invoke(uploadedContent, null);
// Create an HttpInputStream instance
object stream = (Stream)typeHttpInputStream
.GetConstructor(BindingFlags.NonPublic | BindingFlags.Instance, null, streamParams, null)
.Invoke(new object[] {uploadedContent, 0, data.Length});
// Create an HttpPostedFile instance
HttpPostedFile postedFile = (HttpPostedFile)typeof(HttpPostedFile)
.GetConstructor(BindingFlags.NonPublic | BindingFlags.Instance, null, parameters, null)
.Invoke(new object[] {filename, contentType, stream});
return postedFile;
}
关于c# - 如何实例化 HttpPostedFile,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/5514715/