How to Safely Convert Integers to Strings in LINQ to Entities?

Convert integer to string in LINQ to Entities

In LINQ to Entities, trying to assign an integer directly to a string property will result in an error because this conversion is not supported. This problem occurs when processing a query that selects objects with a mix of integer and string properties.

One possible solution is to use the ToString() method to convert the integer to a string before assigning it to the property. However, this approach may also cause exceptions when using LINQ to Entities.

A more reliable solution for converting integers to strings in LINQ to Entities is to use the SqlFunctions.StringConvert method. This method allows you to convert an integer to a string using the specified format. You can successfully convert an integer to a string by converting it to a double or decimal number before using SqlFunctions.StringConvert.

The corrected code using SqlFunctions.StringConvert is as follows:

<code>var items = from c in contacts
            select new ListItem
            {
                Value = SqlFunctions.StringConvert((double)c.ContactId).Trim(),
                Text = c.Name
            };</code>

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