刚开始的时候普通连接出现乱码,我是这么解决的

<add name="blogdbEntities" connectionString="metadata=res://*/Models.BlogDB.csdl|res://*/Models.BlogDB.ssdl|res://*/Models.BlogDB.msl;provider=Devart.Data.MySql;provider connection string=&quot;user id=root;password=root1234;host=127.0.0.1;database=blogdb;persist security info=True;Character Set=utf8&quot;" providerName="System.Data.EntityClient" />

把字符集给指定下。