How to Efficiently Convert a List to SQL Parameters for an IN Clause?

Translating a List into a SqlParameter for a SQL In Statement

The task of translating a List into a SqlParameter for an SQL IN statement requires careful consideration to avoid potential mapping errors. Here's a practical solution to achieve this:

The key strategy is to construct a customized SQL query string using string.Format() and add individual parameters to the command. This can be approached as follows:

1. Construct the SQL Query:

   • Start by setting sql to the base SQL query template with placeholders for the individual parameters, e.g., SELECT dscr FROM system_settings WHERE setting IN ({0}).
   • Use LINQ's Select method to generate an array of parameter names, e.g., ["@settings0", "@settings1"].

2. Format the SQL Query String:

   • Leverage string.Join to combine the parameter names into a comma-separated string and substitute it into the base query using string.Format.

3. Add Individual Parameters:

   • Loop through the settingList and add a new SqlParameter for each item, ensuring the name matches the corresponding placeholder in the query string.

By following these steps, you can successfully translate a List into a SqlParameter collection for use in an SQL IN statement, ensuring query execution without mapping errors.

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