如何使用 C# 在 gridview 中读取动态添加的文本框值？

Question

我想在 GridView 的每个单元格中使用 TextBox 动态添加行和列。我已经成功地做到了。但问题是当我单击按钮时，我无法读取 TextBox 的值。

<asp:GridView runat="server" ID="gv" OnRowDataBound="gv_OnRowDataBound"></asp:GridView>

在网格中动态添加行和列：

protected void btnGenerate_OnClick(object sender, EventArgs e)
{
    int rowsCount = Convert.ToInt32(tbxRow.Text);
    int colsCount = Convert.ToInt32(tbxCol.Text);
    DataTable dt=new DataTable();
    for(int col=0;col<colsCount;col++)
    {
        dt.Columns.Add("D-" + col, typeof (int));
    }
    for (int i = 0; i < rowsCount; i++)
    {
        DataRow dr = dt.NewRow();
        dt.Rows.Add(dr);
    }
    gv.DataSource = dt;
    gv.DataBind();
}

这是我将文本框添加到 GridView 的代码：

protected void gv_OnRowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        for (int i = 0; i < e.Row.Cells.Count; i++)
        {
            TextBox txt = new TextBox();
            txt.ID = "tbx" + i;
            e.Row.Cells[i].Controls.Add(txt);
        }
    }
}

我试过这个来获取TextBox的值，但它总是显示为null：

protected void btnSave_OnClick(object sender, EventArgs e)
{
    foreach (GridViewRow row in gv.Rows)
    {
        if (row.RowType == DataControlRowType.DataRow)
        {
            for (int i = 0; i < row.Cells.Count; i++)
            {
                TextBox tb = (TextBox) row.Cells[i].FindControl("tbx" + i);
            }

        }
    }
}

Answer 1

您必须将它们添加到 OnRowCreated 中，这不仅会在您对网格进行数据绑定时触发，而且会在每次回发时触发：

protected void gv_OnRowCreated(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        for (int i = 0; i < e.Row.Cells.Count; i++)
        {
            TextBox txt = new TextBox();
            txt.ID = "tbx" + i;
            e.Row.Cells[i].Controls.Add(txt);
        }
    }
}

因此，如果要分配文本，则必须使用初始化并将它们添加到 RowCreated 并使用 RowDataBound。

但是你为什么不使用TemplateField 并在那里添加文本框。这让您的生活更轻松。

旁注：如果您枚举网格的Rows-属性，则不需要DataControlRowType.DataRow-check，因为只返回DataRow-items：

protected void btnSave_OnClick(object sender, EventArgs e)
{
    foreach (GridViewRow row in gv.Rows)
    {
        for (int i = 0; i < row.Cells.Count; i++)
        {
            TextBox tb = (TextBox) row.Cells[i].FindControl("tbx" + i);
        }
    }
}

Answer 2

更新

protected void GenerateGridColumn()
{
    int colsCount = Convert.ToInt32(tbxCol.Text);
    TemplateField tfield;
    BoundField bfield = new BoundField();
    bfield.HeaderText = "";
    for (int col = 0; col <= colsCount; col++)
    {
        tfield = new TemplateField();
        tfield.HeaderText = "D-" + col;
        gv.Columns.Add(tfield);
    }
    tfield = new TemplateField();
    tfield.HeaderText = "Supply";
    gv.Columns.Add(tfield);

}
protected void btnGenerate_OnClick(object sender, EventArgs e)
{
    GenerateGridColumn();
    int rowsCount = Convert.ToInt32(tbxRow.Text);
    DataTable dt = new DataTable();
    for (int i = 0; i <= rowsCount; i++)
    {
        DataRow dr = dt.NewRow();
        dt.Rows.Add(dr);
    }
    gv.DataSource = dt;
    gv.DataBind();
    btnSave.Visible = true;
}


protected void gv_OnRowCreated(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        for (int i = 0; i < e.Row.Cells.Count; i++)
        {
            if (i > 0)
            {
                TextBox txt = new TextBox();
                txt.ID = "tbx" + i;
                e.Row.Cells[i].Controls.Add(txt);
            }
        }
    }
}

 protected void btnSave_OnClick(object sender, EventArgs e)
{
foreach (GridViewRow row in gv.Rows)
{
    if (row.RowType == DataControlRowType.DataRow)
    {
        for (int i = 0; i < row.Cells.Count; i++)
        {
            TextBox tb = (TextBox) row.Cells[i].FindControl("tbx" + i);
        }
    }
}
}