How Can We Capture Print Output from a T-SQL Stored Procedure in .NET?

Retrieving Print Output from T-SQL Stored Procedures in .NET Applications

Migrating legacy applications often involves handling T-SQL stored procedures that use PRINT statements for error reporting or informational messages. This article demonstrates how to capture this PRINT output within a .NET environment.

Capturing PRINT Output: A Feasible Solution

Retrieving the output of PRINT statements from a T-SQL stored procedure within your .NET application is achievable. This is crucial for accessing debugging information or error messages embedded within the procedure's logic.

C# Implementation: Event Handling

The solution involves subscribing to the InfoMessage event of the database connection object. Here's a C# code example:

<code class="language-csharp">myConnection.InfoMessage += new SqlInfoMessageEventHandler(myConnection_InfoMessage);

void myConnection_InfoMessage(object sender, SqlInfoMessageEventArgs e)
{
    // Process the captured print message
    Console.WriteLine(e.Message); 
}</code>

Code Breakdown:

• myConnection: Represents the database connection used to execute the stored procedure.
• InfoMessage event: This event triggers whenever the database server sends an informational message, including PRINT output.
• e.Message: This property holds the content of the PRINT statement.

Illustrative Example: Stored Procedure and C# Code

Let's consider a simple stored procedure that prints a message:

<code class="language-sql">CREATE PROCEDURE usp_PrintMessage
AS
    PRINT 'This is a test message.';</code>

The corresponding C# code to execute this procedure and capture the PRINT output is:

<code class="language-csharp">SqlCommand cmd = new SqlCommand("usp_PrintMessage", myConnection);
cmd.CommandType = CommandType.StoredProcedure;

cmd.InfoMessage += myConnection_InfoMessage; // Subscribe to the event

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

// The print message will be displayed on the console.</code>

By subscribing to the InfoMessage event, your C# application effectively intercepts and processes the PRINT output generated by the stored procedure, enabling robust error handling and informative logging.

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