c#下post multipart/form-data和JSON

F:\othre\hcloud\demo\c#\hCLoudDemo\hCLoudDemo\bin\Debug\hCLoudDemo.exe.config F:\othre\hcloud\demo\c#\hCLoudDemo\hCLoudDemo\obj\Debug\hCLoudDemo.Form1.resources F:\othre\hcloud\demo\c#\hCLoudDemo\hCLoudDemo\obj\Debug\hCLoudDemo.Properties.Resources.resources F:\othre\hcloud\demo\c#\hCLoudDemo\hCLoudDemo\obj\Debug\hCLoudDemo.csproj.GenerateResource.Cache F:\othre\hcloud\demo\c#\hCLoudDemo\hCLoudDemo\bin\Debug\hCLoudDemo.exe F:\othre\hcloud\demo\c#\hCLoudDemo\hCLoudDemo\bin\Debug\hCLoudDemo.pdb F:\othre\hcloud\demo\c#\hCLoudDemo\hCLoudDemo\obj\Debug\hCLoudDemo.exe F:\othre\hcloud\demo\c#\hCLoudDemo\hCLoudDemo\obj\Debug\hCLoudDemo.pdb