今天用到DataTable時就順便將DataTable中的一些常識記錄下來,為便備查。
為此寫了個很easy的例子,例子是為我們這些rookie準(zhǔn)備的.
往高手就多多指點例子中的不足,
包含:
1:創(chuàng)建DataTable
2:如何使用for
3:如何使用foreach
static void Main(
string[] args)
![DataTable常識[.NET Framework 2.0]](https://blog.51cto.com/lybing/p_w_picpaths/editer/InBlock.gif)
{
![DataTable常識[.NET Framework 2.0]](https://blog.51cto.com/lybing/p_w_picpaths/editer/InBlock.gif)
DataTable dt = InitialData();
//查找 DataTable 中 A列 值 大于中 A_3 的列![DataTable常識[.NET Framework 2.0]](https://blog.51cto.com/lybing/p_w_picpaths/editer/InBlock.gif)
DataRow[] drs = dt.Select(
"A > 'A_3'",
"A desc");
![DataTable常識[.NET Framework 2.0]](https://blog.51cto.com/lybing/p_w_picpaths/editer/InBlock.gif)
Console.WriteLine(
"A\tB\tC\tD");
//遍歷數(shù)據(jù)
foreach (DataRow row
in drs)
![DataTable常識[.NET Framework 2.0]](https://blog.51cto.com/lybing/p_w_picpaths/editer/InBlock.gif)
{
string a = row[
"A"]
as string;
string b = row[
"B"]
as string;
string c = row[
"C"]
as string;
string d = row[
"D"]
as string;
![DataTable常識[.NET Framework 2.0]](https://blog.51cto.com/lybing/p_w_picpaths/editer/InBlock.gif)
Console.WriteLine(a +
"\t" + b +
"\t" + c +
"\t" + d);
![DataTable常識[.NET Framework 2.0]](https://blog.51cto.com/lybing/p_w_picpaths/editer/InBlock.gif)
}
![DataTable常識[.NET Framework 2.0]](https://blog.51cto.com/lybing/p_w_picpaths/editer/InBlock.gif)
Console.ReadKey();
![DataTable常識[.NET Framework 2.0]](https://blog.51cto.com/lybing/p_w_picpaths/editer/InBlock.gif)
}
/// <summary>/// 初始化測試數(shù)據(jù)/// </summary>
public static DataTable InitialData()
![DataTable常識[.NET Framework 2.0]](https://blog.51cto.com/lybing/p_w_picpaths/editer/InBlock.gif)
{
//創(chuàng)建一個名為:TestTable的數(shù)據(jù)表![DataTable常識[.NET Framework 2.0]](https://blog.51cto.com/lybing/p_w_picpaths/editer/InBlock.gif)
DataTable dt =
new DataTable(
"TestTable");
//為表創(chuàng)建 4列,分別為: A 、 B 、 C 、 D![DataTable常識[.NET Framework 2.0]](https://blog.51cto.com/lybing/p_w_picpaths/editer/InBlock.gif)
dt.Columns.Add(
new DataColumn(
"A"));
![DataTable常識[.NET Framework 2.0]](https://blog.51cto.com/lybing/p_w_picpaths/editer/InBlock.gif)
dt.Columns.Add(
new DataColumn(
"B"));
![DataTable常識[.NET Framework 2.0]](https://blog.51cto.com/lybing/p_w_picpaths/editer/InBlock.gif)
dt.Columns.Add(
new DataColumn(
"C"));
![DataTable常識[.NET Framework 2.0]](https://blog.51cto.com/lybing/p_w_picpaths/editer/InBlock.gif)
dt.Columns.Add(
new DataColumn(
"D"));
for (
int i = 1; i <= 10; i++)
![DataTable常識[.NET Framework 2.0]](https://blog.51cto.com/lybing/p_w_picpaths/editer/InBlock.gif)
{
//添加新的數(shù)據(jù)行,并添加數(shù)據(jù)![DataTable常識[.NET Framework 2.0]](https://blog.51cto.com/lybing/p_w_picpaths/editer/InBlock.gif)
DataRow dr = dt.NewRow();
![DataTable常識[.NET Framework 2.0]](https://blog.51cto.com/lybing/p_w_picpaths/editer/InBlock.gif)
dr[
"A"] =
"A_" + i;
![DataTable常識[.NET Framework 2.0]](https://blog.51cto.com/lybing/p_w_picpaths/editer/InBlock.gif)
dr[
"B"] =
"B_" + i;
![DataTable常識[.NET Framework 2.0]](https://blog.51cto.com/lybing/p_w_picpaths/editer/InBlock.gif)
dr[
"C"] =
"C_" + i;
![DataTable常識[.NET Framework 2.0]](https://blog.51cto.com/lybing/p_w_picpaths/editer/InBlock.gif)
dr[
"D"] =
"D_" + i;
//將此行添加到DataTable中![DataTable常識[.NET Framework 2.0]](https://blog.51cto.com/lybing/p_w_picpaths/editer/InBlock.gif)
dt.Rows.Add(dr);
![DataTable常識[.NET Framework 2.0]](https://blog.51cto.com/lybing/p_w_picpaths/editer/InBlock.gif)
}
return dt;
![DataTable常識[.NET Framework 2.0]](https://blog.51cto.com/lybing/p_w_picpaths/editer/InBlock.gif)
}
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