request.Method = "POST";工作但不是 request.ContentLength

问题描述

有时简单的事情会让你难堪，这对我来说是一件.

Some times the simple things can stump you and here is one for me.

我想做一个简单的网络请求来验证用户名和密码.它在 Windows Phone 8 中运行良好，但我似乎无法获得相同的代码以在 Windows 8 上运行.

I want to do a simple web request to verify a username and password. Its working just fine in Windows Phone 8 but I can not seem to get the same code to work on Windows 8.

我知道我不能像使用 Windows Phone 那样执行 GetResponse，所以我使用 GetResponseAsync 并且如果工作正常，那部分.但是来自服务器的响应是它没有在标头中获得POST"组件.

I understand I can not do a GetResponse as I do with Windows Phone so I am using GetResponseAsync and that part if working fine. But the response from the Server is that it did not get the "POST" component in the header.

这是在我的手机版本上运行良好的 Windows Phone 8 代码

Here is the Windows Phone 8 code that is working fine on my Phone version

 private async void VerifyUser()
        {
            //System.Diagnostics.Debug.WriteLine("aa");

            loginParams = "username=" + username + "&password=" + password;
            string teamResponse = "https://mysite.com/mystuff/LoginApp?" + loginParams;

            var request = HttpWebRequest.Create(teamResponse) as HttpWebRequest;
            request.Method = "POST";
            request.Accept = "application/json;odata=verbose";

            var factory = new TaskFactory();
            var task = factory.FromAsync<WebResponse>(request.BeginGetResponse, request.EndGetResponse, null);

            //System.Diagnostics.Debug.WriteLine("bb");


            try
            {
                var response = await task;

                System.IO.Stream responseStream = response.GetResponseStream();
                string data;
                using (var reader = new System.IO.StreamReader(responseStream))
                {
                    data = reader.ReadToEnd();
                }
                responseStream.Close();
                //System.Diagnostics.Debug.WriteLine("cc");
                webData = data;
                //MessageBox.Show(data);
            }
            catch (Exception e)
            {
                MessageBox.Show("There was a network error.  Please check your network connectivty and try again " + e);
            }

           // System.Diagnostics.Debug.WriteLine(webData);
            JToken token = JObject.Parse(webData);
            string success = (string)token.SelectToken("success");

这是我使用 Visual Studio 2013 为 Windows 8 提供的内容

Here is what I have for Windows 8 using Visual Studio 2013

 private async void VerifyUser()
         {
            string data;
            loginParams = "username=" + logInUserIdString + "&password=" + logInPasswordString;
            string teamResponse = "https://mysite.com/mystuff/LoginApp?" + loginParams;
            Debug.WriteLine(teamResponse);
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(teamResponse);

            HttpWebResponse response = (HttpWebResponse)await request.GetResponseAsync();
            using (var sr = new StreamReader(response.GetResponseStream()))
            {
                data = sr.ReadToEnd();
            }

            Debug.WriteLine(data);
         }

那行得通，但我得到一个简单的响应，只提示用户已登录或未登录.服务器部分说请求的标题中没有POST".

That works but I get back a simple response advising only that the user is logged in or not logged in. The Server chap says that the request did not have "POST" in the header.

所以我添加了以下代码:

SO I added the following code:

request.Method = "POST";
request.Accept = "application/json;odata=verbose";

这里是完整的代码:

 private async void VerifyUser()
         {
            string data;
            loginParams = "username=" + logInUserIdString + "&password=" + logInPasswordString;
            string teamResponse = "https://mysite.com/mystuff/LoginApp?" + loginParams;
            Debug.WriteLine(teamResponse);
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(teamResponse);
            request.Method = "POST";
            request.Accept = "application/json;odata=verbose";
            HttpWebResponse response = (HttpWebResponse)await request.GetResponseAsync();
            using (var sr = new StreamReader(response.GetResponseStream()))
            {
                data = sr.ReadToEnd();
            }

            Debug.WriteLine(data);
         }

然后它只是抛出以下内容:

And then it just throws the following:

'web1.exe' (CLR v4.0.30319: Immersive Application Domain): Loaded 'C:\Windows\system32\WinMetadata\Windows.Foundation.winmd'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
A first chance exception of type 'System.Net.WebException' occurred in mscorlib.dll
An exception of type 'System.Net.WebException' occurred in mscorlib.dll but was not handled in user code
Additional information: The remote server returned an error: (411) Length Required.

那么为什么我不能像 doco 所说的那样在标题中包含POST"?任何帮助将不胜感激.

So why can I not include the "POST" in the header as the doco says I can? Any help would be much appreciated.

更新:我现在知道这是 loginParams 长度的问题.在我的 IOS、Android 和 WindowsPhone 应用程序中，我不必指定长度并且效果很好，但是由于某些原因，Visual Studio 2013 Windows 应用程序不接受设置内容长度.

UPDATE: I now know its an issue with the length of the loginParams. In my IOS, Android and WindowsPhone apps I did not have to specify the length and it works great, but the Visual Studio 2013 Windows App does not accept setting the content length for some reason.

错误如下:System.Net.HttpWebRequest 不包含 ContentLength 的定义，并且找不到接受 System.Net.HttpWebRequest 类型的第一个参数的扩展方法 ContentLength(您是否缺少 using 指令或程序集引用?)

那为什么我不能添加 request.ContentLength???

So why can I not add request.ContentLength???

在对 Domniks 代码请求的响应中，我附上了带有错误消息的代码块图像.再次感谢您的帮助.我附上了我的屏幕图像，它不会被接收

IN Response to Domniks request for the code I have attached a image of the block of code with the error message. Thanks again for helping.I have attached an image of my screen where it wont acc

推荐答案

已解决！！！

使用 Visual Studio 2013 执行 Http Web 请求和响应的正确过程是使用新的 HttpClient 类.我怀疑它会是这样的新课程，但找不到它.浪费了我生命中的 2 天！！

The correct process to do Http web requests and response with Visual Studio 2013 is to use the new HttpClient class. I suspected it would be some new class like this but just could not find it. 2 days of my life have been wasted!!

所以这里是执行 Http 请求的正确代码，例如登录或在我的情况下仅根据用户 ID 和密码验证用户是有效用户.

So here is the correct code to do a Http request to for example log in or in my case to just verify the user is a valid user based on the userID and password.

 private async void VerifyUser()
         {
            loginParams = "username=" + logInUserIdString + "&password=" + logInPasswordString;
            string teamResponse = "https:// mySite.com?" + loginParams;
            Debug.WriteLine(teamResponse);

            HttpClient client = new HttpClient();

            try
            {
                HttpResponseMessage response = await client.PostAsync(new Uri(teamResponse), null);

                response.EnsureSuccessStatusCode();
                string responseBody = await response.Content.ReadAsStringAsync();

                Debug.WriteLine(responseBody);
            }
            catch (HttpRequestException e)
            {
                Debug.WriteLine("\nException Caught!");
                Debug.WriteLine("Message :{0} ", e.Message);
            }

感谢 dbugger 和 Dominik 的帮助，因为您的评论使我朝着让我找到这个解决方案的方向前进.

And thanks heaps to dbugger and Dominik for your help as your comments moved me in the direction that got me to this solution.

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