我现在还不能测试这一权利，但问题可能是你的数据项之间缺少边界。要指定一个，initializting你的 MultipartFormDataContent 如下：

I can't test this right now, but the problem could be a missing boundary between your data items. To specify one, initializting your MultipartFormDataContent as follows:

string boundary = "---###---"; // should never occur in your data
MultipartFormDataContent content = new MultipartFormDataContent(boundary);

更多关于边界：什么是多部分的边界/形式 - 数据？