在 GridView 的空单元格中显示消息

Question

我正在从 excel 导入 GridView 我需要在每个空单元格附近显示一条消息，以向用户提供有关它应该写什么的信息..

void simpleButton1_Click(object sender, System.EventArgs e)
{
    string[] msg = new string[60];
    string[] error = new string[400];
    for (int i = 0; i < gridView3.RowCount ; i++)
    {
        System.Data.DataRow Rows = gridView3.GetDataRow(i);
        string cellvalue = Rows[0].ToString();
        if (cellvalue == "")
        {
            msg[0] = "Missing 'First Name'";
            error[i] = msg[0] + " - ";  
        }   
        cellvalue = Rows[1].ToString();
        if (cellvalue == "")
        {
            msg[1] = "Missing 'Last Name'";
            error[i] += msg[1] + " - ";
        }
        //...
    }
}

如何将变量 msg[] 放入带有小图像或 "!" 图形的特定单元格，或者我可以为单元格着色

Answer 1

改变单元格的颜色

Rows[1].Interior.Color = System.Drawing.ColorTranslator.ToOle(System.Drawing.Color.Red);

Answer 2

也许您可以使用ToolTip 来显示您的警报：

toolTip1.ToolTipIcon = ToolTipIcon.Warning;
toolTip1.ToolTipTitle = "Warning!";
toolTip1.Show("Missing 'First Name'", x, y);

您只需要根据DataGridView的行列大小来猜测单元格的位置即可。

ToolTip 位于 System.Windows.Forms 命名空间中。

Answer 3

您可以使用Conditional Formatting 功能为 XtraGrid 单元格着色：

gridControl1.DataSource = new List<Person> { 
    new Person(){ Name = "John", Age = 25 },
    new Person(){ Name = "Mary", Age = 17 },
    new Person(){ Age = 17  },
    new Person(){ Name = "Ann" },
    new Person(){ Name = "Pit", Age = 5 },
};
StyleFormatCondition nameCondition = new StyleFormatCondition();
nameCondition.Column = gridView1.Columns["Name"];
nameCondition.Condition = FormatConditionEnum.Expression;
nameCondition.Expression = "IsNullOrEmpty([Name])";
nameCondition.Appearance.BackColor = Color.Red;
nameCondition.Appearance.Options.UseBackColor = true;

StyleFormatCondition ageCondition = new StyleFormatCondition();
ageCondition.Column = gridView1.Columns["Age"];
ageCondition.Condition = FormatConditionEnum.Expression;
ageCondition.Expression = "[Age]<10";
ageCondition.Appearance.BackColor = Color.Maroon;
ageCondition.Appearance.Options.UseBackColor = true;

gridView1.FormatConditions.AddRange(new StyleFormatCondition[] { 
    nameCondition, ageCondition
});

结果：

相关链接：
Customizing Appearances of Individual Rows and Cells
Style Format Conditions
Custom Painting (Samples)

Answer 4

参考：How to: Provide Custom Display Text for Data Cells

通过 ColumnView.CustomColumnDisplayText 事件。更多信息 关于自定义绘图和单元格样式请通过Custom Painting Samples，Customizing Appearances of Individual Rows and Cells 文档部分。

检查示例空字符串是否显示在“折扣”列的单元格中，如果它们包含零值。

using DevExpress.XtraGrid.Views.Base;

private void gridView1_CustomColumnDisplayText(object sender, 
CustomColumnDisplayTextEventArgs e) {
   if(e.Column.FieldName == "Discount")
      if(Convert.ToDecimal(e.Value) == 0) e.DisplayText = "";
}

如果您想同时显示Image and text，那么您需要处理GridView 的GridView.CustomDrawCell 事件，这里有一段代码可以根据其他列值（年龄列）更改名称列的颜色)

private void gridView_CustomDrawCell(object sender, RowCellCustomDrawEventArgs e)
    {
        if (e.Column == colName)
        {
            var age = Convert.ToInt32(gridView.GetRowCellValue(e.RowHandle, colAge));
            if (age < 18)
                e.Appearance.BackColor = Color.FromArgb(0xFE, 0xDF, 0x98);
            else
                e.Appearance.BackColor = Color.FromArgb(0xD2, 0xFD, 0x91);
        }
    }