radzen-blazor/RadzenBlazorDemos/Pages/SpreadsheetConditionalFormatting.razor

@using Radzen.Blazor.Spreadsheet
@using Radzen.Documents.Spreadsheet

<RadzenSpreadsheet Workbook=@workbook style="height: 600px" />

@code {
    Workbook workbook = new Workbook();

    class ColorScaleRule : ConditionalFormatBase
    {
        public double Min { get; set; }
        public double Max { get; set; }

        public override Format GetFormat(Cell cell)
        {
            if (cell.Value is double d || (cell.Value is int i && (d = i) == i))
            {
                var ratio = Math.Clamp((d - Min) / (Max - Min), 0, 1);
                var r = (int)(255 * (1 - ratio));
                var g = (int)(200 + 55 * ratio);
                var b = (int)(200 * (1 - ratio));
                return new Format { BackgroundColor = $"#{r:X2}{g:X2}{b:X2}" };
            }
            return null;
        }
    }

    protected override void OnInitialized()
    {
        var sheet = workbook.AddSheet("Conditional Formatting", 35, 12);

        sheet.BeginUpdate();

        sheet.Columns[0] = 160;
        for (int i = 1; i < 12; i++) sheet.Columns[i] = 80;

        var sectionFormat = new Format { Bold = true, FontSize = 12 };
        var headerFormat = new Format { Bold = true, BackgroundColor = "#e3f2fd", Color = "#005da1", TextAlign = TextAlign.Center };

        var random = new Random(42);

        // --- Section 1: Greater Than ---
        sheet.Cells["A1"].Value = "Greater Than 75";
        sheet.Cells["A1"].Format = sectionFormat;
        sheet.Rows[0] = 28;
        sheet.Cells["A2"].Value = "Values > 75 are highlighted in green";
        sheet.Cells["A2"].Format = new Format { Italic = true, Color = "#757575" };
        for (int i = 0; i < 8; i++)
        {
            sheet.Cells[2, i + 1].Value = random.Next(10, 100);
            sheet.Cells[2, i + 1].Format = new Format { TextAlign = TextAlign.Center };
        }
        sheet.ConditionalFormats.Add(RangeRef.Parse("B3:I3"), new GreaterThanRule
        {
            Value = 75,
            Format = new Format { BackgroundColor = "#c8e6c9", Color = "#0f2e10", Bold = true }
        });

        // --- Section 2: Less Than ---
        sheet.Cells["A5"].Value = "Less Than 25";
        sheet.Cells["A5"].Format = sectionFormat;
        sheet.Rows[4] = 28;
        sheet.Cells["A6"].Value = "Values < 25 are highlighted in red";
        sheet.Cells["A6"].Format = new Format { Italic = true, Color = "#757575" };
        for (int i = 0; i < 8; i++)
        {
            sheet.Cells[6, i + 1].Value = random.Next(5, 80);
            sheet.Cells[6, i + 1].Format = new Format { TextAlign = TextAlign.Center };
        }
        sheet.ConditionalFormats.Add(RangeRef.Parse("B7:I7"), new LessThanRule
        {
            Value = 25,
            Format = new Format { BackgroundColor = "#ffcdd2", Color = "#c62828" }
        });

        // --- Section 3: Between ---
        sheet.Cells["A9"].Value = "Between 40 and 60";
        sheet.Cells["A9"].Format = sectionFormat;
        sheet.Rows[8] = 28;
        sheet.Cells["A10"].Value = "Values in range are highlighted in yellow";
        sheet.Cells["A10"].Format = new Format { Italic = true, Color = "#757575" };
        for (int i = 0; i < 8; i++)
        {
            sheet.Cells[10, i + 1].Value = random.Next(20, 90);
            sheet.Cells[10, i + 1].Format = new Format { TextAlign = TextAlign.Center };
        }
        sheet.ConditionalFormats.Add(RangeRef.Parse("B11:I11"), new BetweenRule
        {
            Minimum = 40,
            Maximum = 60,
            Format = new Format { BackgroundColor = "#fff9c4", Color = "#f57f17" }
        });

        // --- Section 4: Equal To ---
        sheet.Cells["A13"].Value = "Equal To 'Pass'";
        sheet.Cells["A13"].Format = sectionFormat;
        sheet.Rows[12] = 28;
        sheet.Cells["A14"].Value = "Cells containing 'Pass' are highlighted";
        sheet.Cells["A14"].Format = new Format { Italic = true, Color = "#757575" };
        string[] grades = { "Pass", "Fail", "Pass", "Pass", "Fail", "Pass", "Fail", "Pass" };
        for (int i = 0; i < grades.Length; i++)
        {
            sheet.Cells[14, i + 1].Value = grades[i];
            sheet.Cells[14, i + 1].Format = new Format { TextAlign = TextAlign.Center };
        }
        sheet.ConditionalFormats.Add(RangeRef.Parse("B15:I15"), new EqualToRule
        {
            Value = "Pass",
            Format = new Format { BackgroundColor = "#c8e6c9", Color = "#2e7d32", Bold = true }
        });
        sheet.ConditionalFormats.Add(RangeRef.Parse("B15:I15"), new EqualToRule
        {
            Value = "Fail",
            Format = new Format { BackgroundColor = "#ffcdd2", Color = "#c62828", Bold = true }
        });

        // --- Section 5: Text Contains ---
        sheet.Cells["A17"].Value = "Text Contains 'error'";
        sheet.Cells["A17"].Format = sectionFormat;
        sheet.Rows[16] = 28;
        sheet.Cells["A18"].Value = "Cells containing 'error' are highlighted in red";
        sheet.Cells["A18"].Format = new Format { Italic = true, Color = "#757575" };
        string[] messages = { "OK", "error: timeout", "OK", "warning", "error: null", "OK", "error: 404", "success" };
        for (int i = 0; i < messages.Length; i++)
        {
            sheet.Cells[18, i + 1].Value = messages[i];
        }
        sheet.ConditionalFormats.Add(RangeRef.Parse("B19:I19"), new TextContainsRule
        {
            Text = "error",
            Format = new Format { BackgroundColor = "#ffcdd2", Color = "#c62828", Bold = true }
        });

        // --- Section 6: Top N ---
        sheet.Cells["A21"].Value = "Top 3 Values";
        sheet.Cells["A21"].Format = sectionFormat;
        sheet.Rows[20] = 28;
        sheet.Cells["A22"].Value = "Top 3 highest values are highlighted in blue";
        sheet.Cells["A22"].Format = new Format { Italic = true, Color = "#757575" };
        for (int i = 0; i < 8; i++)
        {
            sheet.Cells[22, i + 1].Value = random.Next(100, 1000);
            sheet.Cells[22, i + 1].Format = new Format { TextAlign = TextAlign.Center };
        }
        sheet.ConditionalFormats.Add(RangeRef.Parse("B23:I23"), new Top10Rule
        {
            Count = 3,
            Format = new Format { BackgroundColor = "#bbdefb", Color = "#1565c0", Bold = true }
        });

        // --- Section 7: Color Scale (Custom Rule) ---
        sheet.Cells["A25"].Value = "Color Scale (Custom)";
        sheet.Cells["A25"].Format = sectionFormat;
        sheet.Rows[24] = 28;
        sheet.Cells["A26"].Value = "Gradient: red (low) to green (high)";
        sheet.Cells["A26"].Format = new Format { Italic = true, Color = "#757575" };
        sheet.Cells["B26"].Value = "Score"; sheet.Cells["B26"].Format = headerFormat;
        for (int i = 0; i < 8; i++)
        {
            sheet.Cells[26 + i, 1].Value = (i + 1) * 12.5;
            sheet.Cells[26 + i, 1].Format = new Format { TextAlign = TextAlign.Center };
        }
        sheet.ConditionalFormats.Add(RangeRef.Parse("B27:B34"), new ColorScaleRule
        {
            Min = 0,
            Max = 100
        });

        sheet.EndUpdate();
    }
}