How to Resolve Entity Framework Validation Errors Due to Data Type Mismatches?

Validation Errors in Entity Framework Save

In ASP.NET MVC applications using Entity Framework, it is possible to encounter validation errors while saving changes to a SQL Server database. This can occur when there is a mismatch between the data types of properties in the Entity Framework model (such as DateTime and TimeSpan) and the column data types in the database (such as Date and Time).

To resolve this issue and ensure that data is properly validated before saving to the database, it is necessary to cast the appropriate data types manually in the code. For example, in the provided code, the EventDate, StartTime, and EndTime properties are declared as DateTime and TimeSpan, while the corresponding columns in the database are Date, Time, and Time. To fix this, the code can be modified as follows:

public class Event
{
    // ...

    // Convert DateTime to Date before saving
    public DateTime EventDate
    {
        get { return EventDate; }
        set { EventDate = value.Date; }
    }

    // Convert TimeSpan to Time before saving
    public TimeSpan StartTime
    {
        get { return StartTime; }
        set { StartTime = TimeSpan.Parse(value.ToString()); }
    }

    // Convert TimeSpan to Time before saving
    public TimeSpan EndTime
    {
        get { return EndTime; }
        set { EndTime = TimeSpan.Parse(value.ToString()); }
    }

    // ...
}

By casting the data types explicitly, the code ensures that the values conform to the database schema and prevents validation errors. Additionally, it is recommended to handle DbEntityValidationException exceptions in the catch block to obtain detailed information about the validation errors.

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