wpf-16394-controls-and-libraries-spreadsheet-examples-conditional-formatting-how-to-format-cells-that-are-less-than-greater-than-or-equal-to-a-value.md
This example demonstrates how to create the rule that uses a relational operator as a formatting criteria.
To create a new conditional formatting rule represented by the ExpressionConditionalFormatting object, access the collection of conditional formats from the Worksheet.ConditionalFormattings property and call the ConditionalFormattingCollection.AddExpressionConditionalFormatting method. Pass the following parameters:
Specify formatting options to be applied to cells if the condition is true , using the ISupportsFormatting.Formatting property of the ExpressionConditionalFormatting object. Set the background and font colors.
To remove the ExpressionConditionalFormatting object, use the ConditionalFormattingCollection.Remove, ConditionalFormattingCollection.RemoveAt or ConditionalFormattingCollection.Clear methods.
' Create the rule to identify values that are above the average in cells F2 through F15.
Dim cfRule As ExpressionConditionalFormatting = worksheet.ConditionalFormattings.AddExpressionConditionalFormatting(worksheet.Range("$F$2:$F$15"), ConditionalFormattingExpressionCondition.GreaterThan, "=AVERAGE($F$2:$F$15)")
' Specify formatting options to be applied to cells if the condition is true.
' Set the background color to yellow.
cfRule.Formatting.Fill.BackgroundColor = Color.FromArgb(255, &HFA, &HF7, &HAA)
' Set the font color to red.
cfRule.Formatting.Font.Color = Color.Red
// Create the rule to identify values that are above the average in cells F2 through F15.
ExpressionConditionalFormatting cfRule =
worksheet.ConditionalFormattings.AddExpressionConditionalFormatting(worksheet.Range["$F$2:$F$15"], ConditionalFormattingExpressionCondition.GreaterThan, "=AVERAGE($F$2:$F$15)");
// Specify formatting options to be applied to cells if the condition is true.
// Set the background color to yellow.
cfRule.Formatting.Fill.BackgroundColor = Color.FromArgb(255, 0xFA, 0xF7, 0xAA);
// Set the font color to red.
cfRule.Formatting.Font.Color = Color.Red;