MySQL for Visual Studio / Visual Studio 2017数据源向导的问题。 你调用的对象是空的

Question

Windows 10 Pro
Visual Studio 2017 Pro - 15.5.6
MySQL for Visual Studio - 1.2.7
MySQL Connector/NET - 6.10.6.0

I have encountered an issue with MySQL for Visual Studio.

When opening the 'Configuring a Data Source' dialog box, and adding a query, I can query the data fine.

When running the Test Query on the final screen, it fails with the following error:

When finishing the configuration without testing the query, and subsequently running the debug - an Object Reference exception is thrown as shown below:

I have tested this on other solutions that previously worked, but I am getting the same issue.

Any ideas guys?

Answer 1

Fixed it. For anyone who is interested - I did the following:

• Uninstalled MySQL for Visual Studio
• Uninstalled MySQL Connector/Net
• Re-Installed Latest Version for MySQL for Visual Studio
• Installed Previous Version for MySQL Connector/Net (6.9.11)
• Downgraded MySQL.Data to 6.9.11
• Downgraded MySQL.Web to 6.9.11

There appears to be an issue with the latest version of Connector/NET.

I have posted this as a MySQL Connector/NET Bug.

Answer 2

This also occurs in VS2015 using anything over MYSQL for VS 1.2.4 and Connector/NET 6.9.8. When VS2017 was first released it worked with MYSQL but it breaks after making any changes to the MYSQL components, eg upgrading to the latest GA release. I cannot remember the original configuration for the working VS2017. I have tried all combinations of MYSQL for VS and connectors but nothing has worked. Eventually I went back to 2015 because 1.2.4 does not support 2017. (Tried on both Windows 10 Home and Professional) I suppose my answer is downgrade to VS2015, which is not really a fix.