dbproviderfactories | 易学教程

How to use WebMatrix methods with Npgsql in .NET MVC Core 5

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问题 I want to use WebMatrix.Data namespace #region Assembly WebMatrix.Data, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35 // .. \packages\Microsoft.AspNet.WebPages.Data.3.2.7\lib\net45\WebMatrix.Data.dll with Npgsql data provider in ASP MVC Core 5. In web.config it is defined as <system.data> <DbProviderFactories> <clear /> <add name="Npgsql Data Provider" invariant="Npgsql" support="FF" description=".Net Framework Data Provider for Postgresql Server" type="Npgsql

How to use WebMatrix methods with Npgsql in .NET MVC Core 5

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DbProviderFactories.GetFactoryClasses returns no results after installing .NET SQL Client in .NET Core 2.1

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来源： https://stackoverflow.com/questions/52007836/dbproviderfactories-getfactoryclasses-returns-no-results-after-installing-net-s

Custom .NET Data Providers

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问题 Is is possible to use a custom .NET data provider without installing it in the GAC? Can I reference a custom DLL and register it inside my configuration file? 回答1: Yes , you can register an implementation of the DbProviderFactory class by adding the following section in your configuration file: <system.data> <DbProviderFactories> <add name="My Custom Data Provider" invariant="MyCustomDataProvider" description="Data Provider for My Custom Store" type="MyNamespace.MyCustomProviderFactory,

Custom .NET Data Providers

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How to add custom DB provider to be accessible in Visual Studio?

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问题 I wanted to work with custom DB provider in Visual Studio. I need it to use Entity Framework. For example, I downloaded NpgSQL, registered them in GAC: gacutil -i c:\temp\npgsql.dll gacutil -i c:\temp\mono.security.dll and added to machine.config file: <add name="Npgsql Data Provider" invariant="Npgsql" support="FF" description=".Net Framework Data Provider for Postgresql Server" type="Npgsql.NpgsqlFactory, Npgsql, Version=2.0.6.0, Culture=neutral, PublicKeyToken=5d8b90d52f46fda7" /> But

Reader.Read() fails to read rows even though it has rows

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问题 I have a problem where it appears that the reader indicates that it has rows from the returned SQL but the while loop for the reader never runs. I put a messagebox in the reader.hasrows as a verification and I put a messagebox on the first line after the while loop as well. The messagebox for the hasrows is executed but the messagebox for the Read is not executed. It is very puzzling. I tried the query against the database and it indeed does return rows. Here is the code snippet. using

Error when adding a configuration to App.config file

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问题 Related question: Running my application on another machine gives me an error This is how my App.config file looks like: <?xml version="1.0" encoding="utf-8"?> <configuration> <connectionStrings> <add name="DocumentsDBEntities" connectionString="metadata=res://*/Documents.csdl|res://*/Documents.ssdl|res://*/Documents.msl;provider=System.Data.SQLite;provider connection string="data source=C:\Users\Sergio.Tapia\Desktop\DocumentScannerDanyly\DocumentScannerDanyly\DocumentsDB.sqlite""

How can I use ADO.NET DbProviderFactory with MySQL?

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How can I use ADO.NET DbProviderFactory with MySQL? First, you have to install the MySQL .Net Connector . The MySQL Provider factory has the invariant name "MySql.Data.MySqlClient". Below is some example C# code that retrieves all the table names in the local test database and sticks them in a listbox in response to a button click. private void button1_Click(object sender, EventArgs e) { var dbf = DbProviderFactories.GetFactory("MySql.Data.MySqlClient"); using (var dbcn = dbf.CreateConnection()) { dbcn.ConnectionString = "Server=localhost;Database=test;Uid=test;Pwd=test;"; dbcn.Open(); using

How can I use ADO.NET DbProviderFactory with MySQL?

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问题 How can I use ADO.NET DbProviderFactory with MySQL? 回答1: First, you have to install the MySQL .Net Connector. The MySQL Provider factory has the invariant name "MySql.Data.MySqlClient". Below is some example C# code that retrieves all the table names in the local test database and sticks them in a listbox in response to a button click. private void button1_Click(object sender, EventArgs e) { var dbf = DbProviderFactories.GetFactory("MySql.Data.MySqlClient"); using (var dbcn = dbf