WebClient UploadString不工作

Question

我在尝试用WebClient调用的web服务上有两个方法：

[Route("TestDownload")]
[HttpGet]
public string TestDownload()
{
    return "downloaded";
}

[Route("TestUpload")]
[HttpPost]
public string TestUpload(string uploaded)
{
    return uploaded;
}

下面的代码可以工作：

using (var wc = new WebClient())
{
    var sResult = wc.DownloadString("http://localhost/Website/TestDownload");
    Console.WriteLine(sResult);
}

此代码抛出System.Net.WebException：(404) Not Found

using (var wc = new WebClient())
{
    var sResult = wc.UploadString("http://localhost/Website/TestUpload", "test");
    Console.WriteLine(sResult);
}

我做错了什么？谢谢

Answer 1

我想我想通了。WebClient上的UploadString使用字符串参数作为http请求正文。默认情况下，WebApi从查询字符串(参见https://docs.microsoft.com/en-us/aspnet/web-api/overview/formats-and-model-binding/parameter-binding-in-aspnet-web-api)为简单类型(包括字符串)提供控制器方法参数。要覆盖此行为并指示将在请求正文中找到字符串参数，可以使用[FromBody]属性。

[Route("TestUpload")]
[HttpPost]
public string TestUpload([FromBody] string uploaded)
{
    return uploaded;
}

Answer 2

尝试为该控制器/方法添加路由，如下所示：

  routes.MapRoute(
    "yourRouteName", // Route name
    "{controller}/{action}",
    new { controller = "yourController", action = "TestUpload", uploaded="" }  // Parameter defaults
);