C# – Unable to find the requested .Net Framework Data Provider

asp.net-mvc-3cMySQLrazor

Im using Visual Studio 2010 Ultimate, Project is c# MVC3 Razor

I have a project that is running without any problems on local machine using the MySql (from online server) database just fine, but when I upload it and when it gets to the part where needs to get data from MySql server it gives me this error:

Unable to find the requested .Net Framework Data Provider. It may not
be installed.

This is my connection string from Web.config for MySql wich like this is running fine when I debug project locally. Reads the info from tables and shows on the page.

<add name="istakipDBContext" 
connectionString="Server=xxx.xxx.xxx.xxx; Database=xxx; Uid=xxx;
Pwd=xxx;"  providerName="MySql.Data.MySqlClient" />

And this is the whole stack trace:

Server Error in '/' Application. Unable to find the requested .Net
Framework Data Provider. It may not be installed. Description: An
unhandled exception occurred during the execution of the current web
request. Please review the stack trace for more information about the
error and where it originated in the code.

Exception Details: System.ArgumentException: Unable to find the
requested .Net Framework Data Provider. It may not be installed.

Source Error:

An unhandled exception was generated during the execution of the
current web request. Information regarding the origin and location of
the exception can be identified using the exception stack trace below.

Stack Trace:

[ArgumentException: Unable to find the requested .Net Framework Data
Provider. It may not be installed.]
System.Data.Common.DbProviderFactories.GetFactory(String
providerInvariantName) +1420503
System.Data.Entity.Internal.LazyInternalConnection.TryInitializeFromAppConfig(String
name) +393
System.Data.Entity.Internal.LazyInternalConnection.Initialize() +47
System.Data.Entity.Internal.LazyInternalConnection.get_ConnectionHasModel()
+9 System.Data.Entity.Internal.LazyInternalContext.InitializeContext()
+262 System.Data.Entity.Internal.InternalContext.GetEntitySetAndBaseTypeForType(Type
entityType) +17
System.Data.Entity.Internal.Linq.InternalSet1.Initialize() +63 System.Data.Entity.Internal.Linq.InternalSet1.GetEnumerator() +15
System.Data.Entity.Infrastructure.DbQuery1.System.Collections.Generic.IEnumerable<TResult>.GetEnumerator() +40 System.Collections.Generic.List1..ctor(IEnumerable1 collection) +315 System.Linq.Enumerable.ToList(IEnumerable1
source) +58 onlinetercume.Controllers.istakiplerController.Index()
in
C:\wwwroot\nps\nps\Controllers\istakiplerController.cs:21
lambda_method(Closure , ControllerBase , Object[] ) +62
System.Web.Mvc.ActionMethodDispatcher.Execute(ControllerBase
controller, Object[] parameters) +17
System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext
controllerContext, IDictionary2 parameters) +208 System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary2
parameters) +27
System.Web.Mvc.<>c_DisplayClass15.b_12()
+55 System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter
filter, ActionExecutingContext preContext, Func1 continuation) +263 System.Web.Mvc.<>c__DisplayClass17.<InvokeActionMethodWithFilters>b__14() +19 System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodWithFilters(ControllerContext controllerContext, IList1 filters, ActionDescriptor actionDescriptor,
IDictionary2 parameters) +191 System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) +343 System.Web.Mvc.Controller.ExecuteCore() +116 System.Web.Mvc.ControllerBase.Execute(RequestContext requestContext) +97 System.Web.Mvc.ControllerBase.System.Web.Mvc.IController.Execute(RequestContext requestContext) +10 System.Web.Mvc.<>c__DisplayClassb.<BeginProcessRequest>b__5() +37 System.Web.Mvc.Async.<>c__DisplayClass1.<MakeVoidDelegate>b__0() +21 System.Web.Mvc.Async.<>c__DisplayClass81.b__7(IAsyncResult
) +12 System.Web.Mvc.Async.WrappedAsyncResult`1.End() +62 System.Web.Mvc.<>c_DisplayClasse.b_d() +50
System.Web.Mvc.SecurityUtil.b_0(Action f) +7
System.Web.Mvc.SecurityUtil.ProcessInApplicationTrust(Action action)
+22 System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +60
System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult
result) +9
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
+8970061 System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +184

Version Information: Microsoft .NET Framework Version:4.0.30319;
ASP.NET Version:4.0.30319.272

Best Answer

The error is clear, it cannot find the MySQL data provider

If you deployed to your production server perhaps you have not deployed the MySQL component, check you have deployed the MySQL dll's to the bin folder of your application

A common problem is when you have the component installed in the GAC in the development sandboxes and they are not present in the production server, verify if the dll is in the GAC:

The Global Assembly Cache (GAC) is located in: %windir%\assembly

You may force the references from your project to be deployed to the production server by selecting the copy always property of the assembly to true, however, if it is configured to resolve the reference from the GAC then it's better to install the component in the GAC in the production box:

enter image description here

These are the steps to install the MySQL data provider in the GAC

http://blog.jeffreymcmanus.com/555/installing-the-mysql-adonet-connector-into-the-global-assembly-cache/

As a summary:

Solution 1:

Run the following command to register the MySQL data provider in the GAC (this way that version of your MySQL data provider will be installed globally available to all applications in the server)

"C:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\Bin\gacutil.exe" /i MySql.Data.dll
Solution 2:

Copy the MySql.Data.dll dll to the bin directory of your application

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If you meant that you want to decide between using a UNIX timestamp or a native MySQL datetime field, go with the native format. You can do calculations within MySQL that way ("SELECT DATE_ADD(my_datetime, INTERVAL 1 DAY)") and it is simple to change the format of the value to a UNIX timestamp ("SELECT UNIX_TIMESTAMP(my_datetime)") when you query the record if you want to operate on it with PHP.

C# – Error message ‘Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information.’

This error has no true magic bullet answer. The key is to have all the information to understand the problem. Most likely a dynamically loaded assembly is missing a referenced assembly. That assembly needs to be in the bin directory of your application.

Use this code to determine what is missing.

using System.IO;
using System.Reflection;
using System.Text;

try
{
    //The code that causes the error goes here.
}
catch (ReflectionTypeLoadException ex)
{
    StringBuilder sb = new StringBuilder();
    foreach (Exception exSub in ex.LoaderExceptions)
    {
        sb.AppendLine(exSub.Message);
        FileNotFoundException exFileNotFound = exSub as FileNotFoundException;
        if (exFileNotFound != null)
        {                
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            {
                sb.AppendLine("Fusion Log:");
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        sb.AppendLine();
    }
    string errorMessage = sb.ToString();
    //Display or log the error based on your application.
}

Best Answer

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Mysql – Should I use the datetime or timestamp data type in MySQL

C# – Error message ‘Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information.’

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