request.Method = "POST";工作但不是 request.ContentLength [英] request.Method = "POST" working but NOT 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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