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How to fix System.Collections.Generic.KeyNotFoundException “The given key was not present in the dictionary” Exception with MySQL Connector/NET and utf8mb4 character set

An System.Collections.Generic.KeyNotFoundException "The given key was not present in the dictionary" can be the result of using a too old MySQL Connector/NET version in your ASP.NET web application.

By Jan Reilink 18/10/2019MySQL

Code base

ASP and ASP.NET connectionstring examples for Microsoft SQL Server and MySQL

This article provides you with a couple of ASP.NET to SQL Server connectionstring examples for ODBC and OLE DB. And as a bonus for ASP to SQL Server, MySQL, and SSL encrypted connections too.

By Jan Reilink 17/10/2018Code base

Code base

How to: Test MySQL database connectivity in ASP.NET, PHP, ASP

Test MySQL database connectivity in ASP.NET, PHP, ASP; Simple MySQL connection test from your website with ASP.NET, PHP & classic ASP. Whenever you need a MySQL connectivity test from a website or server, it's handy to have various test scripts nearby. Whether it is because you are setting up a new website or you have just installed a new server and are running your tests.

By Jan Reilink 26/05/2014Code base

Web applications

MySQL Connector/NET and Entity Framework

How to let MySQL Connector/NET, ASP.NET and Entity Framework play nicely. Set up and check your Web.config website configuration.

By Jan Reilink 26/02/2013Web applications

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How to fix System.Collections.Generic.KeyNotFoundException “The given key was not present in the dictionary” Exception with MySQL Connector/NET and utf8mb4 character set

ASP and ASP.NET connectionstring examples for Microsoft SQL Server and MySQL

How to: Test MySQL database connectivity in ASP.NET, PHP, ASP

MySQL Connector/NET and Entity Framework

Windows Server

Web applications

PowerShell