ADO.Net:检查IDataRecord上是否存在字段名称

using System;
using System.Data;
using System.Data.SqlClient;

public class Program
{
    public static void Main()
    {
        string connectionString = "YourConnectionString";
        string query = "YourQuery";

        using (SqlConnection connection = new SqlConnection(connectionString))
        {
            SqlCommand command = new SqlCommand(query, connection);
            connection.Open();

            SqlDataReader reader = command.ExecuteReader();

            if (reader.HasRows)
            {
                // 检查字段名称是否存在
                if (reader.GetOrdinal("FieldName") != -1)
                {
                    // 字段存在
                    Console.WriteLine("字段存在");
                }
                else
                {
                    // 字段不存在
                    Console.WriteLine("字段不存在");
                }
            }

            reader.Close();
        }
    }
}