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SqlCommand.Connection 属性

定义

获取或设置 SqlConnection 的此实例 SqlCommand 使用的 。

public:
 property Microsoft::Data::SqlClient::SqlConnection ^ Connection { Microsoft::Data::SqlClient::SqlConnection ^ get(); void set(Microsoft::Data::SqlClient::SqlConnection ^ value); };
public Microsoft.Data.SqlClient.SqlConnection Connection { get; set; }
member this.Connection : Microsoft.Data.SqlClient.SqlConnection with get, set
Public Property Connection As SqlConnection

属性值

到数据源的连接。 默认值为null .

例外

命令在事务中登记时 Connection 属性被更改。

示例

以下示例创建 SqlCommand 并设置其一些属性。

// <Snippet1>
using System;
using System.Data;
using Microsoft.Data.SqlClient;


namespace SqlCommandCS
{
    class Program
    {
        static void Main()
        {
            string str = "Data Source=(local);Initial Catalog=Northwind;"
                + "Integrated Security=SSPI";
            string qs = "SELECT OrderID, CustomerID FROM dbo.Orders;";
            CreateCommand(qs, str);
        }

        private static void CreateCommand(string queryString,
            string connectionString)
        {
            using (SqlConnection connection = new SqlConnection(
                       connectionString))
            {
                SqlCommand command = new SqlCommand();
                command.Connection = connection;
                command.CommandTimeout = 15;
                command.CommandType = CommandType.Text;
                command.CommandText = queryString;

                connection.Open();
                SqlDataReader reader = command.ExecuteReader();
                while (reader.Read())
                {
                    Console.WriteLine(String.Format("{0}, {1}",
                        reader[0], reader[1]));
                }
            }
        }
        // </Snippet1>
    }
}

注解

如果命令已在现有事务中登记,并且连接已更改,则尝试执行该命令将引发 InvalidOperationException

如果 Transaction 属性不为 null,而事务已提交或回滚,则会将 Transaction 设置为 null。

适用于