C#中DataTable的创建与遍历

柔情只为你懂 2021-09-16 13:44 464阅读 0赞

C\#中DataTable的创建与遍历

**1、创建DataTable对象**

/// <summary>
    /// 创建DataTable对象
    /// </summary>
    public static DataTable CreateDataTable()
    {
        //创建DataTable
        DataTable dt = new DataTable("NewDt");
                
        //创建自增长的ID列
        DataColumn dc = dt.Columns.Add("ID", Type.GetType("System.Int32"));
        dc.AutoIncrement = true;   //自动增加
        dc.AutoIncrementSeed = 1;  //起始为1
        dc.AutoIncrementStep = 1;  //步长为1
        dc.AllowDBNull = false;    //非空
    
        //创建其它列表
        dt.Columns.Add(new DataColumn("Name", Type.GetType("System.String")));
        dt.Columns.Add(new DataColumn("Age", Type.GetType("System.Int32")));
        dt.Columns.Add(new DataColumn("Score", Type.GetType("System.Decimal")));
        dt.Columns.Add(new DataColumn("CreateTime", Type.GetType("System.DateTime")));
    
        //创建数据
        DataRow dr = dt.NewRow();
        dr["Name"] = "张三";
        dr["Age"] = 28;
        dr["Score"] = 85.5;
        dr["CreateTime"] = DateTime.Now;
        dt.Rows.Add(dr);
    
        dr = dt.NewRow();
        dr["Name"] = "李四";
        dr["Age"] = 24;
        dr["Score"] = 72;
        dr["CreateTime"] = DateTime.Now;
        dt.Rows.Add(dr);
    
        dr = dt.NewRow();
        dr["Name"] = "王五";
        dr["Age"] = 36;
        dr["Score"] = 63.5;
        dr["CreateTime"] = DateTime.Now;
        dt.Rows.Add(dr);
    
        return dt;
    }

**2、遍历DataTable对象**

/// <summary>
    /// 遍历DataTable对象,转换成List对象
    /// </summary>
    public static List<UserInfo> TraverseDataTable(DataTable dt)
    {
        List<UserInfo> userList = new List<UserInfo>();
    
        //判断DataTable是否为空
        if (dt == null || dt.Rows.Count == 0)
        {
            return null;
        }
    
        //遍历DataTable对象,转换成List
        foreach (DataRow row in dt.Rows)
        {
            UserInfo user = new UserInfo();
    
            if (dt.Columns.Contains("ID") && !Convert.IsDBNull(row["ID"]))
                user.ID = Convert.ToInt32(row["ID"]);
    
            if (dt.Columns.Contains("Name") && !Convert.IsDBNull(row["Name"]))
                user.Name = Convert.ToString(row["Name"]);
    
            if (dt.Columns.Contains("Age") && !Convert.IsDBNull(row["Age"]))
                user.Age = Convert.ToInt32(row["Age"]);
    
            if (dt.Columns.Contains("Score") && !Convert.IsDBNull(row["Score"]))
                user.Score = Convert.ToDouble(row["Score"]);
    
            if (dt.Columns.Contains("CreateTime") && !Convert.IsDBNull(row["CreateTime"]))
                user.CreateTime = Convert.ToDateTime(row["CreateTime"]);
    
            userList.Add(user);
        }
    
        return userList;
    }

其它代码：

/// <summary>
    /// 用户信息类
    /// </summary>
    public class UserInfo
    {
        /// <summary>
        /// 编号
        /// </summary>
        public int ID { get; set; }
    
        /// <summary>
        /// 名称
        /// </summary>
        public string Name { get; set; }
    
        /// <summary>
        /// 年龄
        /// </summary>
        public int Age { get; set; }
    
        /// <summary>
        /// 成绩
        /// </summary>
        public double Score { get; set; }
    
        /// <summary>
        /// 创建时间
        /// </summary>
        public DateTime CreateTime { get; set; }
    }