C#中DataTable的创建与遍历实现

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; }
}

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