Agfdhyk

How do I use the SqlClient directive with .NET Standard 2.0?

using System;

using System.Collections.Generic;

using System.Text;

using System.Data;

using System.Data.SqlClient;

Having great difficulty with Visual Studio at the minute, when I run my program I am greeted with the following exception:

System.IO.FileNotFoundException: 'Could not load file or assembly 'System.Data.SqlClient, Version=4.4.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.'

Resulting in the application not running, the directive has been installed via NuGet and my class .csproj looks like:

  <Project Sdk="Microsoft.NET.Sdk">



  <PropertyGroup>

    <TargetFramework>netstandard2.0</TargetFramework>

  </PropertyGroup>



  <ItemGroup>

    <PackageReference Include="System.Data.SqlClient" Version="4.5.1" />

  </ItemGroup>



</Project>

The Form's framewwork is set to .NET framework 4.6.1...
I can not change the class framework to match, and I am not sure if this is causing the error?

The methods - that are causing the error - referenced from the Class:

//Connect to Database

    public void Connection()

    {

        try

        {

            // Create SqlConnection

            connString = "Data Source = xx; Initial Catalog = xx; User ID = xx; Password = xx";

            con = new SqlConnection(connString);

            con.Open();

        }

        catch (Exception ex)

        {

            string error;

            error = ex.ToString();

        }

    }

Option 1) You might have already tried this.
Remove the reference & add it manually.

Option 2) Somehow System.Data.SqlClient dll is missing from your output or build folder
So, try adding post build script.

<Target Name="PostBuild" AfterTargets="PostBuildEvent">

    <Exec Command="copy ......packagesSystem.Data.SqlClientruntimeswinlibnetstandard2.0System.Data.SqlClient.dll binDebugappname" Condition="'$(IsWindows)' == 'true'" />

    <Exec Command="cp ../../../packages/System.Data.SqlClient/runtimes/unix/lib/netstandard2.0/System.Data.SqlClient.dll bin/Debug/appname/" Condition="'$(IsWindows)' != 'true'" />

</Target>