How Can I Correctly Set Command Timeouts in Entity Framework to Avoid Function Import Timeouts?

Entity Framework Timeout: Set CommandTimeout correctly

When using Entity Framework (EF), if you encounter a function import timeout (more than 30 seconds), it is important to understand the steps to correctly set the command timeout. While adding "Default Command Timeout=300000" to the connection string may seem simple and straightforward, there are known bugs with this approach in some versions of EF.

To resolve this issue, manually set the CommandTimeout directly on the context object in the repository. In EF 4 and lower, use this.context.CommandTimeout = 180;. In EF 5, use ((IObjectContextAdapter)this.context).ObjectContext.CommandTimeout = 180;. In EF 6, use this.context.Database.CommandTimeout = 180;. In EF Core 1.0, use this.context.Database.SetCommandTimeout(180);.

By setting the CommandTimeout directly, you ensure that the timeout value is applied to all queries executed by this context. It is important to note that setting conflicting timeout values ​​in the connection string may interfere with manually set CommandTimeout, so the best practice is to remove the timeout value from the connection string.

By following these steps, you can prevent EF from timing out when processing large data sets and use EF efficiently even in situations that require large data retrieval operations.

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