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Editorial Team
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Asked: 2026-06-08T23:47:08+00:00

I have added a Format Condition on a range with some formatting using the

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I have added a Format Condition on a range with some formatting using the below code.

Microsoft.Office.Interop.Excel.FormatCondition formatConditionObj = null;

formatConditionObj = (Microsoft.Office.Interop.Excel.FormatCondition)myRange
    .FormatConditions.Add(Excel.XlFormatConditionType.xlExpression, 
    Type.Missing, true, Type.Missing, Type.Missing, Type.Missing, 
    Type.Missing, Type.Missing);

formatConditionObj.Interior.ColorIndex = 5;

Now my range changes dynamically.I want that using the same FormatCondition object i just change the range where this formats are applied. For e.g at the first instance it might be just "$A$1" later it might be "$A$2,$D$5" or "$A$3:$A$20".

This can be done using excel directly. Contitional Formatting -> Manage Rules -> Applies To(Edit this). How can be this acheived using C#.

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1 Answer

  1. Editorial Team

    This works for me. I find putting the “using” line below at the top saves a good deal of effort.

    using Microsoft.Office.Interop.Excel;

<...>

        formatConditionObj = (FormatCondition)myRange.FormatConditions
            .Add(XlFormatConditionType.xlExpression, 
            Type.Missing, true, Type.Missing, Type.Missing, 
            Type.Missing, Type.Missing, Type.Missing);

        formatConditionObj.Interior.ColorIndex = 5;

        Range myNewRange = ws.Range["a10:a15"];
        formatConditionObj.ModifyAppliesToRange(myNewRange);

 <...>
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