Use HttpClient to send http request , it will thrown exception "System.MissingMethodException: Method not found: 'Void System.Net.HttpWebRequest.set_

[Tonny_Qitai]

Hi,

we just have a simply c# program to send http request to web server with httpclient API ,it works on local machine but failed on window2012 R2 VM and thrown expection of "System.MissingMethodException: Method not found: 'Void System.Net.HttpWebRequest.set_SslProtocols(System.Security.Authentication.SslProtocols)".

The simple code like below:

string strurl = "Hire Workers Online!";

HttpClient theConnect = new HttpClient();
HttpResponseMessage hresult = theConnect.GetAsync(strurl).Result;

if (hresult.IsSuccessStatusCode)
{
Task<string> t = hresult.Content.ReadAsStringAsync();
string s = t.Result;
MessageBox.Show(s);
}

it work well on most of local developer computer (win7 and win10 and win2016) but only failed on one windows 2012 r2 with exception below:

************** Exception Text **************
System.AggregateException: One or more errors occurred. ---> System.MissingMethodException: Method not found: 'Void System.Net.HttpWebRequest.set_SslProtocols(System.Security.Authentication.SslProtocols)'.
at System.Net.Http.HttpClientHandler.CreateAndPrepareWebRequest(HttpRequestMessage request)
at System.Net.Http.HttpClientHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
--- End of inner exception stack trace ---
at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
at System.Threading.Tasks.Task`1.GetResultCore(Boolean waitCompletionNotification)
at System.Threading.Tasks.Task`1.get_Result()
at tHttpClient.Form1.button1_Click(Object sender, EventArgs e) in E:\work\temp-proj\tHttpClient\Form1.cs:line 26
at System.Windows.Forms.Control.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ButtonBase.WndProc(Message& m)
at System.Windows.Forms.Button.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
---> (Inner Exception #0) System.MissingMethodException: Method not found: 'Void System.Net.HttpWebRequest.set_SslProtocols(System.Security.Authentication.SslProtocols)'.
at System.Net.Http.HttpClientHandler.CreateAndPrepareWebRequest(HttpRequestMessage request)
at System.Net.Http.HttpClientHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)<---



************** Loaded Assemblies **************
mscorlib
Assembly Version: 4.0.0.0
Win32 Version: 4.6.81.0 built by: NETFXREL2
CodeBase: file:///C:/Windows/Microsoft.NET/Framework/v4.0.30319/mscorlib.dll
----------------------------------------
tHttpClient
Assembly Version: 1.0.0.0
Win32 Version: 1.0.0.0
CodeBase: file:///C:/Users/administrator.ADFS/Desktop/httpclient/Debug/tHttpClient.exe
----------------------------------------
System.Windows.Forms
Assembly Version: 4.0.0.0
Win32 Version: 4.6.81.0 built by: NETFXREL2
CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Windows.Forms/v4.0_4.0.0.0__b77a5c561934e089/System.Windows.Forms.dll
----------------------------------------
System
Assembly Version: 4.0.0.0
Win32 Version: 4.6.81.0 built by: NETFXREL2
CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System/v4.0_4.0.0.0__b77a5c561934e089/System.dll
----------------------------------------
System.Drawing
Assembly Version: 4.0.0.0
Win32 Version: 4.6.81.0 built by: NETFXREL2
CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Drawing/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll
----------------------------------------
System.Configuration
Assembly Version: 4.0.0.0
Win32 Version: 4.6.81.0 built by: NETFXREL2
CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Configuration/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Configuration.dll
----------------------------------------
System.Core
Assembly Version: 4.0.0.0
Win32 Version: 4.6.81.0 built by: NETFXREL2
CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Core/v4.0_4.0.0.0__b77a5c561934e089/System.Core.dll
----------------------------------------
System.Xml
Assembly Version: 4.0.0.0
Win32 Version: 4.6.81.0 built by: NETFXREL2
CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Xml/v4.0_4.0.0.0__b77a5c561934e089/System.Xml.dll
----------------------------------------
System.Net.Http
Assembly Version: 4.0.0.0
Win32 Version: 4.7.3221.0 built by: NET472REL1LAST_C
CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Net.Http/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Net.Http.dll

I just check and confirm that : the window2012R2 vm use the same System.Net.Http.dll as others.

any comments or idea about this?

Best regards

Tonny

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