I think we have this figured out.  It looks like we can use the row-based conditional formatting to add the border we need based on a hidden value.

The one thing, during testing, that I noticed is that using a target column to check equal to a string value doesn't seem to work.  We wind up using the custom condition text to set up a formula, e.g.,

ISNet.WebUI.WebGrid.WebGridFormatCondition fmt = new ISNet.WebUI.WebGrid.WebGridFormatCondition();
fmt.Name = "RowConditional1";
fmt.TargetObject = ISNet.WebUI.WebGrid.TargetObjectType.Row;
fmt.CustomConditionText = "testTargetColumn = 'String Value'";
fmt.Operator = ColumnFilterType.NotSet;
fmt.FormatStyle.BorderSettings.Bottom.Color = System.Drawing.Color.Gray;
fmt.FormatStyle.BorderSettings.Bottom.Style = BorderStyle.Solid;
fmt.FormatStyle.BorderSettings.Bottom.Width = Unit.Pixel(1);
fmt.Enabled = true;

this.RootTable.FormatConditions.Add(fmt);

Why does the grid crash when we use the built-in operator and condition but works when we use the custom condition for Boolean and Int types?

If we set a custom condition of "underline=1" this works fine.

If we set the TargetColumnMember to "underline", set Operator to ColumnFiltertype.EqualTo and set ConditionText to "1" the grid crashes upon rendering which doesn't make any sense.  The same thing happens if we use an Int where the value is other than 0 or 1.  Any ideas?  At least the workaround of using the custom condition text is working right now.

I tried to reproduce the problem in my local test by creating a simple sample of WebGrid. The grid is bind to “Products” table of Northwind.mdb database. In InitializeLayout server-side event WebGridFormatCondition with following configuration is added.

protected void WebGrid1_InitializeLayout(object sender, ISNet.WebUI.WebGrid.LayoutEventArgs e)
{
    //specific row
    WebGridFormatCondition a = new WebGridFormatCondition();
    a.Name = "Format3";
    a.ColumnMember = "UnitPrice";
    a.ConditionText = "14";
    a.Operator = ColumnFilterType.GreaterThan;
    a.FormatStyle.Font.Italic = true;
    a.FormatStyle.Font.Bold = true;
    a.TargetObject = TargetObjectType.Row;

    WebGrid1.RootTable.FormatConditions.Add(a);
}

The format condition configuration uses a simple matching mode where the specified ColumnMember – UnitPrice –; Operator – GreaterThan –; and ConditionText – 14 – match.

When viewed in browser, rows which has “UnitPrice” greater than 14 are rendered with bold format and italic. The problematic behavior is not reproducible in the attached simple sample.

Please kindly let me know if you have different result.