How Can I Capture Stored Procedure Print Output in .NET Applications?

Accessing Stored Procedure Print Output within .NET Applications

Modernizing applications often involves integrating legacy systems, presenting challenges like handling stored procedures using the PRINT statement for error logging. This method, while functional in SQL Server Management Studio or command-line interfaces, is not directly accessible in .NET. This article demonstrates how to capture this output and redirect it for better management.

The solution involves utilizing the InfoMessage event of the SqlConnection class. By subscribing to this event, your .NET application can intercept and process PRINT statements from stored procedures.

Here's an illustrative example:

<code class="language-csharp">using System.Data.SqlClient;
using System.Data;

// Connection string (replace with your actual connection string)
string connectionString = @"<conn_string>";

using (SqlConnection connection = new SqlConnection(connectionString))
{
    // Subscribe to the InfoMessage event
    connection.InfoMessage += Connection_InfoMessage;

    // Prepare the stored procedure call
    SqlCommand cmd = new SqlCommand("usp_printWord", connection);
    cmd.CommandType = CommandType.StoredProcedure;

    connection.Open();

    // Execute the stored procedure
    cmd.ExecuteNonQuery();

    connection.Close();
}

// Event handler to process the captured output
void Connection_InfoMessage(object sender, SqlInfoMessageEventArgs e)
{
    // Display the captured message
    Console.WriteLine(e.Message);
}</code>

This approach ensures that critical error messages from legacy stored procedures are not overlooked during the integration process, maintaining data integrity and streamlining the transition to .NET.

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