如何在 Mono Ubuntu 上找到 MySql 的 .Net Framework 数据提供程序的存在？
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【中文标题】如何在 Mono Ubuntu 上找到 MySql 的 .Net Framework 数据提供程序的存在？【英文标题】：How to find existence of .Net Framework Data Provider for MySql on Mono Ubuntu? 【发布时间】：2016-01-25 08:03:41 【问题描述】：solving basic porting issues 之后，我试图从 ASP.NET Mono 项目连接到 mysql 数据库。
每当我尝试连接数据库时，都会抛出以下错误（请运行 sn -p）：
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<style type="text/css">
body background-color: #FFFFFF; font-size: .75em; font-family: Verdana, Helvetica, Sans-Serif; margin: 0; padding: 0; color: #696969;
a:link color: #000000; text-decoration: underline;
a:visited color: #000000;
a:hover color: #000000; text-decoration: none;
a:active color: #12eb87;
p, ul margin-bottom: 20px; line-height: 1.6em;
pre font-size: 1.2em; margin-left: 20px; margin-top: 0px;
h1, h2, h3, h4, h5, h6 font-size: 1.6em; color: #000; font-family: Arial, Helvetica, sans-serif;
h1 font-weight: bold; margin-bottom: 0; margin-top: 0; padding-bottom: 0;
h2 font-size: 1em; padding: 0 0 0px 0; color: #696969; font-weight: normal; margin-top: 0; margin-bottom: 20px;
h2.exceptionMessage white-space: pre;
h3 font-size: 1.2em;
h4 font-size: 1.1em;
h5, h6 font-size: 1em;
#header position: relative; margin-bottom: 0px; color: #000; padding: 0; background-color: #5c87b2; height: 38px; padding-left: 10px;
#header h1 font-weight: bold; padding: 5px 0; margin: 0; color: #fff; border: none; line-height: 2em; font-family: Arial, Helvetica, sans-serif; font-size: 32px !important;
#header-image float: left; padding: 3px; margin-left: 1px; margin-right: 1px;
#header-text color: #fff; font-size: 1.4em; line-height: 38px; font-weight: bold;
#main padding: 20px 20px 15px 20px; background-color: #fff; _height: 1px;
#footer color: #999; padding: 5px 0; text-align: left; line-height: normal; margin: 20px 0px 0px 0px; font-size: .9em; border-top: solid 1px #5C87B2;
#footer-powered-by float: right;
.details font-family: monospace; border: solid 1px #e8eef4; white-space: pre; font-size: 1.2em; overflow: auto; padding: 6px; margin-top: 6px; background-color: #eeeeff; color: 555555
.details-wrapped white-space: normal
.details-header margin-top: 1.5em
.details-header a font-weight: bold; text-decoration: none
p margin-bottom: 0.3em; margin-top: 0.1em
.sourceErrorLine color: #770000; font-weight: bold;
</style>
<script type="text/javascript">
var hideElementsById = new Array ();
window.onload = function ()
if (!hideElementsById || hideElementsById.length < 1)
return;
for (index in hideElementsById)
toggle (hideElementsById [index]);
function toggle (divId)
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var h = document.getElementById (divId + "Hint");
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if (h)
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else
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if (h)
h.innerHTML = " (click to hide)";
</script>
<title>Error 500</title>
</head>
<body>
<div class="page">
<div id="header">
<div id="header-text">Application Exception</div>
</div>
<div id="main">
<h1>System.ArgumentException</h1>
<h2 class="exceptionMessage">Unable to find the requested .Net Framework Data Provider. It may not be installed.</h2>
<p><strong>Description:</strong> HTTP 500.Error processing request.</p><p><strong>Details:</strong> Non-web exception. Exception origin (name of application or object): System.Data.</p>
<div><strong>Exception stack trace:</strong></div>
<div class="details"> at System.Data.Common.DbProviderFactories.GetFactory (System.String providerInvariantName) [0x00036] in <filename unknown>:0
at System.Data.Entity.Infrastructure.DependencyResolution.DefaultProviderFactoryResolver.GetService (System.Type type, System.Object key, System.Func`3 handleFailedLookup) [0x0003b] in <filename unknown>:0 </div><div id="footer">
<div style="color:Black;"><strong>Version Information:</strong> <tt>4.2.1 (Stable 4.2.1.102/6dd2d0d Thu Nov 12 09:52:44 UTC 2015)</tt>; ASP.NET Version: <tt>4.0.30319.17020</tt></div>
<div id="footer-powered-by">Powered by <a href="http://mono-project.com/">Mono</a></div>
</div>
</div>
</div>
</body>
</html>
<!--
[System.ArgumentException]: The ADO.NET provider with invariant name 'MySql.Data.MySqlClient' is either not registered in the machine or application config file, or could not be loaded. See the inner exception for details.
at System.Data.Entity.Infrastructure.DependencyResolution.DefaultProviderFactoryResolver.<GetService>b__0 (System.ArgumentException e, System.String n) [0x0000c] in <filename unknown>:0
at System.Data.Entity.Infrastructure.DependencyResolution.DefaultProviderFactoryResolver.GetService (System.Type type, System.Object key, System.Func`3 handleFailedLookup) [0x00045] in <filename unknown>:0
at System.Data.Entity.Infrastructure.DependencyResolution.DefaultProviderFactoryResolver.GetService (System.Type type, System.Object key) [0x00000] in <filename unknown>:0
at System.Data.Entity.Infrastructure.DependencyResolution.CachingDependencyResolver+<>c__DisplayClass1.<GetService>b__0 (System.Tuple`2 k) [0x00000] in <filename unknown>:0
at System.Collections.Concurrent.ConcurrentDictionary`2[TKey,TValue].GetOrAdd (System.Collections.Concurrent.TKey key, System.Func`2 valueFactory) [0x00037] in <filename unknown>:0
at System.Data.Entity.Infrastructure.DependencyResolution.CachingDependencyResolver.GetService (System.Type type, System.Object key) [0x00032] in <filename unknown>:0
at System.Data.Entity.Infrastructure.DependencyResolution.ResolverChain+<>c__DisplayClass3.<GetService>b__0 (IDbDependencyResolver r) [0x00000] in <filename unknown>:0
at System.Linq.Enumerable+WhereSelectArrayIterator`2[TSource,TResult].MoveNext () [0x0004d] in <filename unknown>:0
at System.Linq.Enumerable.FirstOrDefault[TSource] (IEnumerable`1 source, System.Func`2 predicate) [0x00048] in <filename unknown>:0
at System.Data.Entity.Infrastructure.DependencyResolution.ResolverChain.GetService (System.Type type, System.Object key) [0x0002d] in <filename unknown>:0
at System.Data.Entity.Infrastructure.DependencyResolution.RootDependencyResolver.GetService (System.Type type, System.Object key) [0x00022] in <filename unknown>:0
at System.Data.Entity.Infrastructure.DependencyResolution.ResolverChain+<>c__DisplayClass3.<GetService>b__0 (IDbDependencyResolver r) [0x00000] in <filename unknown>:0
at System.Linq.Enumerable+WhereSelectArrayIterator`2[TSource,TResult].MoveNext () [0x0004d] in <filename unknown>:0
at System.Linq.Enumerable.FirstOrDefault[TSource] (IEnumerable`1 source, System.Func`2 predicate) [0x00048] in <filename unknown>:0
at System.Data.Entity.Infrastructure.DependencyResolution.ResolverChain.GetService (System.Type type, System.Object key) [0x0002d] in <filename unknown>:0
at System.Data.Entity.Infrastructure.DependencyResolution.CompositeResolver`2[TFirst,TSecond].GetService (System.Type type, System.Object key) [0x00021] in <filename unknown>:0
at System.Data.Entity.Infrastructure.DependencyResolution.DbDependencyResolverExtensions.GetService[T] (IDbDependencyResolver resolver, System.Object key) [0x0000c] in <filename unknown>:0
at System.Data.Entity.Internal.LazyInternalConnection.CreateConnectionFromProviderName (System.String providerInvariantName) [0x00005] in <filename unknown>:0
at System.Data.Entity.Internal.LazyInternalConnection.InitializeFromConnectionStringSetting (System.Configuration.ConnectionStringSettings appConfigConnection) [0x0003b] in <filename unknown>:0
at System.Data.Entity.Internal.LazyInternalConnection.TryInitializeFromAppConfig (System.String name, System.Data.Entity.Internal.AppConfig config) [0x0000b] in <filename unknown>:0
at System.Data.Entity.Internal.LazyInternalConnection.Initialize () [0x0005b] in <filename unknown>:0
at System.Data.Entity.Internal.LazyInternalConnection.get_ProviderName () [0x00000] in <filename unknown>:0
at System.Data.Entity.Internal.LazyInternalContext.get_ProviderName () [0x00000] in <filename unknown>:0
at System.Data.Entity.Internal.DefaultModelCacheKeyFactory.Create (System.Data.Entity.DbContext context) [0x0002b] in <filename unknown>:0
at System.Data.Entity.Internal.LazyInternalContext.InitializeContext () [0x0009b] in <filename unknown>:0
at System.Data.Entity.Internal.InternalContext.Initialize () [0x00000] in <filename unknown>:0
at System.Data.Entity.Internal.InternalContext.GetEntitySetAndBaseTypeForType (System.Type entityType) [0x00000] in <filename unknown>:0
at System.Data.Entity.Internal.Linq.InternalSet`1[TEntity].Initialize () [0x0000e] in <filename unknown>:0
at System.Data.Entity.Internal.Linq.InternalSet`1[TEntity].get_InternalContext () [0x00000] in <filename unknown>:0
at System.Data.Entity.Infrastructure.DbQuery`1[TResult].System.Linq.IQueryable.get_Provider () [0x00016] in <filename unknown>:0
at System.Data.Entity.QueryableExtensions.FirstOrDefaultAsync[TSource] (IQueryable`1 source, System.Linq.Expressions.Expression`1 predicate, CancellationToken cancellationToken) [0x0001f] in <filename unknown>:0
at System.Data.Entity.QueryableExtensions.FirstOrDefaultAsync[TSource] (IQueryable`1 source, System.Linq.Expressions.Expression`1 predicate) [0x0001f] in <filename unknown>:0
at Microsoft.AspNet.Identity.EntityFramework.UserStore`6+<GetUserAggregateAsync>d__6c[TUser,TRole,TKey,TUserLogin,TUserRole,TUserClaim].MoveNext () [0x000d9] in <filename unknown>:0
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in <filename unknown>:0
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x0004e] in <filename unknown>:0
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x0002e] in <filename unknown>:0
at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x0000b] in <filename unknown>:0
at System.Runtime.CompilerServices.TaskAwaiter`1[TResult].GetResult () [0x00000] in <filename unknown>:0
at Microsoft.AspNet.Identity.TaskExtensions+CultureAwaiter`1[T].GetResult () [0x0000c] in <filename unknown>:0
at Microsoft.AspNet.Identity.Owin.SignInManager`2+<PasswordSignInAsync>d__29[TUser,TKey].MoveNext () [0x000ad] in <filename unknown>:0
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in <filename unknown>:0
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x0004e] in <filename unknown>:0
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x0002e] in <filename unknown>:0
at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x0000b] in <filename unknown>:0
at System.Runtime.CompilerServices.TaskAwaiter`1[TResult].GetResult () [0x00000] in <filename unknown>:0
at UI.Controllers.AccountController+<Login>c__async4.MoveNext () [0x00123] in /home/xameeramir/Projects/UI/UI/Controllers/AccountController.cs:337
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in <filename unknown>:0
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x0004e] in <filename unknown>:0
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x0002e] in <filename unknown>:0
at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x0000b] in <filename unknown>:0
at System.Runtime.CompilerServices.TaskAwaiter.GetResult () [0x00000] in <filename unknown>:0
at System.Threading.Tasks.TaskHelpersExtensions.ThrowIfFaulted (System.Threading.Tasks.Task task) [0x00007] in <filename unknown>:0
at System.Web.Mvc.Async.TaskAsyncActionDescriptor.EndExecute (IAsyncResult asyncResult) [0x0000d] in <filename unknown>:0
at System.Web.Mvc.Async.AsyncControllerActionInvoker+<>c__DisplayClass37.<BeginInvokeAsynchronousActionMethod>b__36 (IAsyncResult asyncResult) [0x00000] in <filename unknown>:0
at System.Web.Mvc.Async.AsyncResultWrapper+WrappedAsyncResult`1[TResult].CallEndDelegate (IAsyncResult asyncResult) [0x00000] in <filename unknown>:0
at System.Web.Mvc.Async.AsyncResultWrapper+WrappedAsyncResultBase`1[TResult].End () [0x00029] in <filename unknown>:0
at System.Web.Mvc.Async.AsyncResultWrapper.End[TResult] (IAsyncResult asyncResult, System.Object tag) [0x00007] in <filename unknown>:0
at System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod (IAsyncResult asyncResult) [0x00000] in <filename unknown>:0
at System.Web.Mvc.Async.AsyncControllerActionInvoker+AsyncInvocationWithFilters.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3d () [0x00014] in <filename unknown>:0
at System.Web.Mvc.Async.AsyncControllerActionInvoker+AsyncInvocationWithFilters+<>c__DisplayClass46.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3f () [0x00002] in <filename unknown>:0
[System.ArgumentException]: Unable to find the requested .Net Framework Data Provider. It may not be installed.
at System.Data.Common.DbProviderFactories.GetFactory (System.String providerInvariantName) [0x00036] in <filename unknown>:0
at System.Data.Entity.Infrastructure.DependencyResolution.DefaultProviderFactoryResolver.GetService (System.Type type, System.Object key, System.Func`3 handleFailedLookup) [0x0003b] in <filename unknown>:0
-->摘自web.config：
<entityFramework>
<providers>
<provider invariantName="MySql.Data.MySqlClient" type="MySql.Data.MySqlClient.MySqlProviderServices, MySql.Data.Entity.EF6"/>
<provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer"/>
</providers>
<defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework" >
<parameters>
<parameter value="mssqllocaldb"/>
</parameters>
</defaultConnectionFactory>
</entityFramework>
.Net Framework Data Provider 确实已安装？
非常感谢任何帮助！
【问题讨论】：
你有MySqlClient dll的引用吗？
system.data.sqlite.org/index.html/info/2be4298631（该链接适用于 SQLite，但适用于所有 ADO.NET 提供程序）您还必须配置 <system.data> 部分，或者 Mono 如何加载提供程序？
作为一个警告，不要使用 cmets 来请别人回答你的问题。这些在整个网站上都被标记了，我已经删除了所有我找到的。
@BradLarson 哎呀，我的目的纯粹是为了引起人们对这些问题的关注。除了 cmets，你还有什么推荐的？顺便说一句，在这种情况下，您使用 cmets 做什么？ Lolz 另外，感谢您为清洁 SO 所做的努力 :)
@student - 如果人们想回答你的问题，他们会想办法解决的。评论将用于澄清问题或答案，或提供补充信息。我只为此使用了评论，因为我不想直接发送版主消息，这会在您的帐户中留下永久记录。
【参考方案1】：
您可以使用此代码（采用https://msdn.microsoft.com/en-us/library/12kxkt25(v=vs.80).aspx）列出所有提供商。在我的具有不变名称 MySql.Data.MySqlClient" 的环境提供程序中没有列出
using System;
using System.Collections.Generic;
using System.Text;
using System.Data.Common;
using System.Data;
namespace ConsoleApplication3
class Program
static void Main(string[] args)
DataTable table = DbProviderFactories.GetFactoryClasses();
// Display each row and column value.
foreach (DataRow row in table.Rows)
foreach (DataColumn column in table.Columns)
Console.WriteLine("0:1",column.ColumnName, row[column]);
Console.WriteLine("----------------------------");
【讨论】：
我会检查一下然后回来以上是关于如何在 Mono Ubuntu 上找到 MySql 的 .Net Framework 数据提供程序的存在？的主要内容，如果未能解决你的问题，请参考以下文章
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