Passing a List of Strings to a SQL Server Stored Procedure from C#
This guide demonstrates how to pass a list of strings as a parameter to a SQL Server stored procedure from your C# application. This method utilizes a User-Defined Table Type (UDTT), suitable for SQL Server 2008 and later versions.
Defining the User-Defined Table Type (UDTT)
First, create a UDTT in SQL Server to represent your string list:
CREATE TYPE [dbo].[StringList] AS TABLE( [Item] [NVARCHAR](MAX) NULL );
Modifying the Stored Procedure
Next, modify your stored procedure to accept the UDTT as input:
CREATE PROCEDURE [dbo].[sp_UseStringList] @list StringList READONLY AS BEGIN -- Process the string list SELECT l.Item FROM @list l; END
C# Implementation
Here's how to use the UDTT within your C# code:
using (SqlConnection con = new SqlConnection(connstring)) { con.Open(); using (SqlCommand cmd = new SqlCommand("sp_UseStringList", con)) { cmd.CommandType = CommandType.StoredProcedure; cmd.Parameters.AddWithValue("@list", CreateStringListTable(new List<string> { "Apple", "Banana", "Orange" })); using (SqlDataReader reader = cmd.ExecuteReader()) { while (reader.Read()) { // Process each string from the reader string item = reader["Item"].ToString(); Console.WriteLine(item); } } } } //Helper function to create the DataTable private DataTable CreateStringListTable(List<string> stringList) { DataTable dt = new DataTable(); dt.Columns.Add("Item", typeof(string)); foreach (string str in stringList) { dt.Rows.Add(str); } return dt; }
Executing the Stored Procedure (SQL Example)
For testing purposes, you can execute the stored procedure directly in SQL Server Management Studio (SSMS) like this:
DECLARE @list AS StringList; INSERT INTO @list VALUES ('Apple'); INSERT INTO @list VALUES ('Banana'); INSERT INTO @list VALUES ('Orange'); EXEC sp_UseStringList @list;
This approach offers a robust and efficient way to handle lists of strings when interacting with SQL Server stored procedures from your C# applications. The use of a UDTT ensures data integrity and improves performance compared to other methods.
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