C# Datatable中对某列求和

方法一：循环

double ColumnSum(DataTable dt, string ColumnName)  
{  
    double d = 0;  
    foreach (DataRow row in dt.Rows)  
    {  
        d += double.Parse(row[ColumnName].ToString());  
    }  
    return d;  
}  

方法二：

DataTable dt=this.GridView1.Datasouce as DataTable;  
string Sum = dt.Compute("sum(jine)", "true").ToString();