Question

我的整个应用程序只是连接到mysql数据库并使用Entityframework插入数据。代码在本地运行良好，但当我在亚马逊服务器上传时，它只是给我这个错误：你可以在http://fb1.131x.com/test_data.aspx

看到

描述：执行当前Web请求期间发生了未处理的异常。请查看堆栈跟踪以获取有关错误及其源自代码的位置的更多信息。详细信息：System.NullReferenceException：未将对象引用设置为对象的实例。

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: 


[NullReferenceException: Object reference not set to an instance of an object.]
   MySql.Data.MySqlClient.MySqlClientFactory.get_MySqlDbProviderServicesInstance() +126
   MySql.Data.MySqlClient.MySqlClientFactory.System.IServiceProvider.GetService(Type serviceType) +39
   System.Data.Common.DbProviderServices.GetProviderServices(DbProviderFactory factory) +89
   System.Data.Metadata.Edm.Loader.InitializeProviderManifest(Action`3 addError) +174
   System.Data.EntityModel.SchemaObjectModel.Schema.HandleAttribute(XmlReader reader) +301
   System.Data.EntityModel.SchemaObjectModel.SchemaElement.ParseAttribute(XmlReader reader) +121
   System.Data.EntityModel.SchemaObjectModel.SchemaElement.Parse(XmlReader reader) +106
   System.Data.EntityModel.SchemaObjectModel.Schema.HandleTopLevelSchemaElement(XmlReader reader) +49
   System.Data.EntityModel.SchemaObjectModel.Schema.InternalParse(XmlReader sourceReader, String sourceLocation) +984
   System.Data.EntityModel.SchemaObjectModel.Schema.Parse(XmlReader sourceReader, String sourceLocation) +245
   System.Data.EntityModel.SchemaObjectModel.SchemaManager.ParseAndValidate(IEnumerable`1 xmlReaders, IEnumerable`1 sourceFilePaths, SchemaDataModelOption dataModel, AttributeValueNotification providerNotification, AttributeValueNotification providerManifestTokenNotification, ProviderManifestNeeded providerManifestNeeded, IList`1& schemaCollection) +472
   System.Data.Metadata.Edm.Loader.LoadItems(IEnumerable`1 xmlReaders, IEnumerable`1 sourceFilePaths) +162
   System.Data.Metadata.Edm.StoreItemCollection.Init(IEnumerable`1 xmlReaders, IEnumerable`1 filePaths, Boolean throwOnError, DbProviderManifest& providerManifest, DbProviderFactory& providerFactory, String& providerManifestToken, Memoizer`2& cachedCTypeFunction) +203
   System.Data.Metadata.Edm.StoreItemCollection..ctor(IEnumerable`1 xmlReaders, IEnumerable`1 filePaths) +305
   System.Data.Metadata.Edm.StoreMetadataEntry.LoadStoreCollection(EdmItemCollection edmItemCollection, MetadataArtifactLoader loader) +129
   System.Data.Metadata.Edm.MetadataCache.LoadItemCollection(IItemCollectionLoader`1 itemCollectionLoader, T entry) +165
   System.Data.Metadata.Edm.MetadataCache.GetOrCreateStoreAndMappingItemCollections(String cacheKey, MetadataArtifactLoader loader, EdmItemCollection edmItemCollection, Object& entryToken) +245
   System.Data.EntityClient.EntityConnection.LoadStoreItemCollections(MetadataWorkspace workspace, DbConnection storeConnection, DbProviderFactory factory, DbConnectionOptions connectionOptions, EdmItemCollection edmItemCollection, MetadataArtifactLoader artifactLoader) +312
   System.Data.EntityClient.EntityConnection.GetMetadataWorkspace(Boolean initializeAllCollections) +802
   System.Data.EntityClient.EntityConnection.InitializeMetadata(DbConnection newConnection, DbConnection originalConnection, Boolean closeOriginalConnectionOnFailure) +11108961
   System.Data.EntityClient.EntityConnection.Open() +198
   System.Data.Objects.ObjectContext.EnsureConnection() +97
   System.Data.Objects.ObjectContext.SaveChanges(SaveOptions options) +651
   System.Data.Entity.Internal.InternalContext.SaveChanges() +218
   test_data.Page_Load(Object sender, EventArgs e) +231
   System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +25
   System.Web.UI.Control.LoadRecursive() +71
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3064
Exception

我还粘贴我的webconfig，我尝试使用6.3.5和6.4.4版本，我只是得到相同的错误。

<?xml version="1.0" encoding="utf-8"?>
<!--
  For more information on how to configure your ASP.NET application, please visit
  http://go.microsoft.com/fwlink/?LinkId=169433
  -->
<configuration>
    <configSections>
        <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
        <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=4.4.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
    </configSections>
    <system.web>
        <customErrors mode="Off" />
        <compilation debug="true" targetFramework="4.0">
            <assemblies>
                <add assembly="System.Security, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A" />
                <add assembly="System.Data.Entity, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
                <add assembly="System.Data.Entity.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
            </assemblies>
            <buildProviders>
                <add extension=".edmx" type="System.Data.Entity.Design.AspNet.EntityDesignerBuildProvider" />
            </buildProviders>
        </compilation>
    </system.web>
    <system.data>
        <DbProviderFactories>
            <remove invariant="MySql.Data.MySqlClient" />
            <add name="MySQL Data Provider" invariant="MySql.Data.MySqlClient" description=".Net Framework Data Provider for MySQL" type="MySql.Data.MySqlClient.MySqlClientFactory, MySql.Data, Version=6.3.5.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d" />
        </DbProviderFactories>
    </system.data>
    <entityFramework>
        <defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework">
            <parameters>
                <parameter value="v11.0" />
            </parameters>
        </defaultConnectionFactory>
    </entityFramework>
    <connectionStrings>
        <add name="fb131xEntities" connectionString="metadata=res://*/App_Code.FBDS.csdl|res://*/App_Code.FBDS.ssdl|res://*/App_Code.FBDS.msl;provider=MySql.Data.MySqlClient;provider connection string=&quot;server=fb131x.db.8808454.hostedresource.com;user id=fb131x;password=aA!259214;persist security info=True;database=fb131x&quot;" providerName="System.Data.EntityClient" />
    </connectionStrings>
</configuration>

Answer 1

您似乎没有包含MySql.Data.Entity的参考。没有它，dll将无效。

Answer 2

这些是你可以尝试的一些事情。在托管服务提供商上部署应用程序始终是一个困难的步骤。一旦它开始，它确实会开始。

a.build clean。
b.build mysql dll进入你的bin目录
c。为MySQL.Data和MySQL.Data.Entities安装nuget包。（（右键单击在汇编时确保Copy Local在构建之前设置为true）
d。完全移除版本= 6.3.5.0标签并且不使用任何构建在VS.type =“MySql.Data.MySqlClient.MySqlClientFactory上进行版本控制， MySql.Data“而不是指定完整版本数据。

Mysql Connector始终将Object引用设置为未设置为对象的实例

2 个答案: