工作笔记-Datatable部分

//克隆DataTable1的结构
DataTable newDataTable = dta.Clone();
for (int i = 0; i < dtb.Columns.Count; i++)
{
//再向新表中加入DataTable2的列结构
newDataTable.Columns.Add(dtb.Columns[i].ColumnName);
}
object[] obj = new object[newDataTable.Columns.Count];
//添加DataTable1的数据
for (int i = 0; i < dta.Rows.Count; i++)
{
dta.Rows[i].ItemArray.CopyTo(obj, 0);
newDataTable.Rows.Add(obj);
}

if (dta.Rows.Count >= dtb.Rows.Count)
{
for (int i = 0; i < dtb.Rows.Count; i++)
{
for (int j = 0; j < dtb.Columns.Count; j++)
{
newDataTable.Rows[i][j + dta.Columns.Count] = dtb.Rows[i][j].ToString();
}
}
}
else
{
DataRow dr3;
//向新表中添加多出的几行
for (int i = 0; i < dtb.Rows.Count - dta.Rows.Count; i++)
{
dr3 = newDataTable.NewRow();
newDataTable.Rows.Add(dr3);
}
for (int i = 0; i < dtb.Rows.Count; i++)
{
for (int j = 0; j < dtb.Columns.Count; j++)
{
newDataTable.Rows[i][j + dta.Columns.Count] = dtb.Rows[i][j].ToString();
}
}
}
newDataTable.TableName = "dts"; //设置DT的名字

double douC = double.Parse(datatable的id名.Compute("sum(列名)", null).ToString());

for (int i = 1; i <= dt.Rows.Count;i++ )
{
this.控件ID.Text += dt.Rows[i-1]["列名"].ToString().Trim();
this.控件ID.Text += " ";
}

DataTable Tdt = new DataTable();
1.添加指定的列
Tdt.Columns.Add("列名1");
Tdt.Columns.Add("列名2");
Tdt.Columns.Add("列名3");
Tdt.Columns.Add("列名4");
2.添加行 (每次添加都要加新的行)
DataRow dr = Tdt.NewRow();
dr["列名1"] = "值";
dr["列名2"] = "值";
dr["列名3"] = "值";
dr["列名4"] = "值";
Tdt.Rows.Add(dr);

DataTable exdt = DataBase.ExecuteTable(ref exsql);      //数据库查询出来的数据
DataTable newdt = exdt.Clone();
foreach (DataRow row in exdt.Rows)
{
DataRow dr = newdt.NewRow();
dr.ItemArray = row.ItemArray;
Random random = new Random();
newdt.Rows.InsertAt(dr, random.Next(newdt.Rows.Count));//这里注意随机出来的数字是否会超界
}