如何从变量中插入数据到数据表

how to insert data into datatable from variable

我想用从变量中获取的值填充 DataTable。我正在用 c# 编写代码。我有一个名为摘要的 DataTable,我已经创建了列,我需要将值添加到变量 averageremaining_sharesales_proceedcost_sale 中的值, realized_profit.

代码如下:

protected void Button1_Click(object sender, EventArgs e)
{
    average = 25;
    remaining_share = 30;
    sales_proceed = 125;
    cost_sale = 50;
    realized_profit = 33;
    var dataTablesummary = new DataTable();
    dataTablesummary.Columns.Add("average", typeof(decimal));
    dataTablesummary.Columns.Add("Remaining share", typeof(decimal));
    dataTablesummary.Columns.Add("sales_proceed", typeof(decimal));
    dataTablesummary.Columns.Add("cost_sale", typeof(decimal));
    dataTablesummary.Columns.Add("realized_profit", typeof(decimal));
}

我想在单击按钮时向 DataTable 添加值,请告诉我如何操作。

您必须使用 dataTablesummary.NewRow();dataTablesummary 创建一个新行,然后为新创建的行赋值。然后将此行添加到数据表中:

 var dr = dataTablesummary.NewRow();
 dr["average"] = average;
 dr["Remaining share"] = remaining_share;
 dr["cost_sale"] = sales_proceed;
 dr["realized_profit"] = realized_profit;
 dataTablesummary.Rows.Add(dr);

考虑到 average, remaining_share, sales_proceed, cost_sale, realized_profit 是您要插入行的变量,以下行

dataTablesummary.Rows.Add(average, remaining_share, sales_proceed, cost_sale, realized_profit);

会的。

protected void Button1_Click(object sender, EventArgs e)
{
    average = 25;
    remaining_share = 30;
    sales_proceed = 125;
    cost_sale = 50;
    realized_profit = 33;
    var dataTablesummary = new DataTable();
    dataTablesummary.Columns.Add("average", typeof(decimal));
    dataTablesummary.Columns.Add("Remaining share", typeof(decimal));     dataTablesummary.Columns.Add("sales_proceed", typeof(decimal));
    dataTablesummary.Columns.Add("cost_sale", typeof(decimal));
    dataTablesummary.Columns.Add("realized_profit", typeof(decimal));
    dataTablesummary.Rows.Add(average, remaining_share, sales_proceed, cost_sale, realized_profit);
}
//Create a datarow of type dataTablesummary
DataRow dr=dataTablesummary.NewRow();    
//can be populated by methods like:
dr["average"] = 1.2;
dr["Remaining share"] = 5.7
dr["cost_sale"] = 5.4;
dr["realized_profit"] = 1.78;    
//Now add the row to datatable
dataTablesummary.Rows.Add(dr);

您可以用变量替换数字

您需要调用 datatable 实例的 newrow()。它 return 一个数据行实例,其行具有与 table 相同的单元格数。现在你可以像我这样绑定数据了。

 DataRow dr=dataTablesummary.NewRow();
 dr["average"] = average;
 dr["Remaining share"] = remaining_share;
 dr["cost_sale"] = sales_proceed;
 dr["realized_profit"] = realized_profit;
 dataTablesummary.Rows.Add(dr);

如果你不知道列名你可以这样写

 DataRow dr=dataTablesummary.NewRow();
 dr[0] = average;
 dr[1] = remaining_share;
 dr[2] = sales_proceed;
 dr[3] = realized_profit;
 dataTablesummary.Rows.Add(dr);