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public class DataColumn : MarshalByValueComponent
{
public DataColumn(string columnName) : this(columnName, typeof(string), null, MappingType.Element){}
dt.Columns.Add("a",typeof(int));
dt.Columns.Add("b",typeof(int));
dv.Sort = "a desc";
dv.Sort = "a asc";
int[,] a = new int[4, 2];
a[0, 0] = 1;
a[0, 1] = 10;
a[1, 0] = 2;
a[1, 1] = 15;
a[2, 0] = 3;
a[2, 1] = 9;
a[3, 0] = 4;
a[3, 1] = 12;
DataTable dt = new DataTable();
dt.Columns.Add("a");
dt.Columns.Add("b");
if (a[2, 1] > a[1, 1])
{
System.Console.Write("9比15还打?");
}
else
{
System.Console.WriteLines("还是15大些!");
}
for (int i = 0; i < 4; i++)
{
DataRow dr = dt.NewRow();
for (int j = 0; j < 2; j++)
{
if (j == 0)
{
dr[0] = a[i, 0];
}
else
{
dr[1] = a[i, 1];
}
}
dt.Rows.Add(dr);
}
DataView dv = new DataView(dt);
dv.Sort = "b desc";
public sealed class DataColumnCollection : InternalDataCollectionBase
{
public DataColumn Add(string columnName)
{
DataColumn column = new DataColumn(columnName);
this.Add(column);
return column;
}