.Net MySql error “The given key was not present in the dictionary”

Question

Trying to get simple count from table results in exception bellow. Tried different select statemens which also makes exception: \"SELECT * FROM goods\", but \"<

Answer 1

I have solved your same error simply adding the charset to the connection string:

Server=myServer;Port=3306;Database=myDB15;User ID=usr33;Password=usr33P;CharSet=utf8;

In my case I'm using MySql Connector for .Net version 6.9.3. to connect to 30 equal databases with the same structure, same collation (utf8_unicode_ci) and different table contents.

When I ran MySqlCommand.ExecuteReader() method to select content from user table, in some databases (4 of 30) a got the same error The given key was not present in the dictionary.