ASP.. NET GridView在BoundField上使用FindControl()来操作字段

本文关键字：FindControl 字段 操作 GridView NET BoundField ASP | 更新日期: 2023-09-27 18:03:14

我正在使用一个为不同位置硬编码列的旧应用程序，现在正在添加新位置，我决定尝试使事物动态填充。该应用程序的一个功能是，当状态被认为"不好"时，显示红色文本并保持文本。这是通过使用FindControl()"

使用TemplateFields从选定行的单元格中获取。

现在我已经设置了它来使用绑定字段，那么我该如何在DataBound事件期间更改文本颜色、大小等呢?

BoundField被添加到GridView

        BoundField statusField = new BoundField();
        statusField.DataField = "ExceptionStatusCode";
        statusField.HeaderText = "Status";
        statusField.SortExpression = "ExceptionStatusCode";
        this.gvView.Columns.Add(statusField);

DataBound Event For GridView

    protected void gvView_DataBound(object sender, EventArgs e)
    {
        foreach (GridViewRow row in this.gvView.Rows)
        {
            //NO LONGER WORKS, NEED TO KNOW HOW TO REPRODUCE
            //WHAT IS BELOW FOR BOUND FIELD
            Label lblPartStatus = ((Label) row.Cells[StatusColumn].FindControl("lblPartStatus"));
            if (lblPartStatus.Text == "BAD")
            {
                lblPartStatus.ForeColor = System.Drawing.Color.Red;
                row.ToolTip = "One or more locations is missing information!";
                row.BackColor = System.Drawing.Color.Salmon;
            }
        }
    }

ASP.. NET GridView在BoundField上使用FindControl()来操作字段

几年前，我写了一些代码来帮助您使用列的SortExpression, HeaderText或DataField找到单元格索引。这些年帮我省了很多力气，你就叫它myRow.Cells[myRow.GetCellIndexByFieldHandle(myDataFieldName)] 

public static class Utility
{
    /// <summary>
    /// Gets the ordinal index of a TableCell in a rendered GridViewRow, using a text fieldHandle (e.g. the corresponding column's DataFieldName/SortExpression/HeaderText)
    /// </summary>
    public static int GetCellIndexByFieldHandle(this GridView grid, string fieldHandle)
    {
        int iCellIndex = -1;
        for (int iColIndex = 0; iColIndex < grid.Columns.Count; iColIndex++)
        {
            if (grid.Columns[iColIndex] is DataControlField)
            {
                DataControlField col = (DataControlField)grid.Columns[iColIndex];
                if ((col is BoundField && string.Compare(((BoundField)col).DataField, fieldHandle, true) == 0)
                    || string.Compare(col.SortExpression, fieldHandle, true) == 0
                    || col.HeaderText.Contains(fieldHandle))
                {
                    iCellIndex = iColIndex;
                    break;
                }
            }
        }
        return iCellIndex;
    }
    /// <summary>
    /// Gets the ordinal index of a TableCell in a rendered GridViewRow, using a text fieldHandle (e.g. the corresponding column's DataFieldName/SortExpression/HeaderText)
    /// </summary>
    public static int GetCellIndexByFieldHandle(this GridViewRow row, string fieldHandle)
    {
        return GetCellIndexByFieldHandle((GridView)row.Parent.Parent, fieldHandle);
    }
}

一旦你有了单元格，我建议你通过设置Cell.CssClass来操作它，然后使用CSS来相应地设置它的样式。避开行内样式，这是你在设置ForeColor, BackColor等时得到的

如果你的网格中总是有X列，你可以这样访问它们:

void grid_RowDataBound(Object sender, GridViewRowEventArgs e)
  {
    if(e.Row.RowType == DataControlRowType.DataRow)
    {
      string text = e.Row.Cells[1].Text;
      if( text.Equals("BAD") )
      {
         //do your stuff...
      }
    }
  }

现在将单元格索引更改为您感兴趣的索引列。将函数附加到OnRowDataBound事件而不是OnDataBound

一个粗略的解决方案是将列索引添加到ViewState…

statusField.SortExpression = "ExceptionStatusCode";
ViewState("StatusIndex") = this.gvView.Columns.Count;
this.gvView.Columns.Add(statusField);

…然后在数据绑定

上再次使用
Label lblPartStatus = ((Label) row.Cells[ViewState("StatusIndex")].FindControl("lblPartStatus"));
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