添加条件格式 OpenXML C#

Question

如何使用 C# .Net 在 OpenXML 中添加条件格式。我希望应用以下条件：

=INDIRECT("D"&ROW())="Disapproved" 那么规则应该适用于：=$1:$3,$N$4:$XFD$4,$5:$1048576

我的功能设置如下：

using (SpreadsheetDocument document = SpreadsheetDocument.Open(openFileDialog1.FileName, true))
{
   // apply conditions here
}

Answer 1

要添加条件格式，您需要将ConditionalFormatting 实例添加到Worksheet。该对象将保存条件格式应应用于的引用列表。 ConditionalFormatting 实例需要 ConditionalFormattingRule 来定义要使用的规则，而规则又是通过 Formula 定义的。

为了使条件格式对电子表格产生影响，您还需要定义要使用的样式。这需要添加到DifferentialFormat，然后再添加到DifferentialFormats。

以下代码将采用现有文档并添加您需要的条件格式：

using (SpreadsheetDocument document = SpreadsheetDocument.Open(filename, true))
{
    WorkbookPart workbookPart = document.WorkbookPart;
    //get the correct sheet
    Sheet sheet = workbookPart.Workbook.Descendants<Sheet>().Where(s => s.Name == sheetName).First();
    WorksheetPart worksheetPart = workbookPart.GetPartById(sheet.Id) as WorksheetPart;
    SheetData sheetData = worksheetPart.Worksheet.Elements<SheetData>().First();

    //grab the stylesPart so we can add the style to apply (create one if one doesn't already exist)
    WorkbookStylesPart stylesPart = document.WorkbookPart.GetPartsOfType<WorkbookStylesPart>().FirstOrDefault();
    if (stylesPart == null)
    {
        stylesPart = workbookPart.AddNewPart<WorkbookStylesPart>();
        stylesPart.Stylesheet = new Stylesheet();
    }

    //create a fills object to hold the background colour we're going to apply
    Fills fills = new Fills() { Count = 1U };

    //grab the differential formats part so we can add the style to apply (create one if one doesn't already exist)
    bool addDifferentialFormats = false;
    DifferentialFormats differentialFormats = stylesPart.Stylesheet.GetFirstChild<DifferentialFormats>();
    if (differentialFormats == null)
    {
        differentialFormats = new DifferentialFormats() { Count = 1U };
        addDifferentialFormats = true;
    }

    //create the conditional format reference
    ConditionalFormatting conditionalFormatting = new ConditionalFormatting()
    {
        SequenceOfReferences = new ListValue<StringValue>()
        {
            InnerText = "A1:XFD3 N4:XFD4 A5:XFD1048576"
        }
    };

    //create a style to assign to the conditional format
    DifferentialFormat differentialFormat = new DifferentialFormat();
    Fill fill = new Fill();
    PatternFill patternFill = new PatternFill();
    BackgroundColor backgroundColor = new BackgroundColor() { Rgb = new HexBinaryValue() { Value = "0000ff00" } };
    patternFill.Append(backgroundColor);
    fill.Append(patternFill);
    differentialFormat.Append(fill);
    differentialFormats.Append(differentialFormat);

    //create the formula
    Formula formula1 = new Formula();
    formula1.Text = "INDIRECT(\"D\"&ROW())=\"Disapproved\"";

    //create a new conditional formatting rule with a type of Expression
    ConditionalFormattingRule conditionalFormattingRule = new ConditionalFormattingRule()
    {
        Type = ConditionalFormatValues.Expression,
        FormatId = 0U,
        Priority = 1
    };

    //append the formula to the rule
    conditionalFormattingRule.Append(formula1);

    //append th formatting rule to the formatting collection
    conditionalFormatting.Append(conditionalFormattingRule);

    //add the formatting collection to the worksheet
    //note the ordering is important; there are other elements that should be checked for here really.
    //See the spec for all of them and see https://stackoverflow.com/questions/25398450/why-appending-autofilter-corrupts-my-excel-file-in-this-example/25410242#25410242
    //for more details on ordering
    PageMargins margins = worksheetPart.Worksheet.GetFirstChild<PageMargins>();
    if (margins != null)
        worksheetPart.Worksheet.InsertBefore(conditionalFormatting, margins);
    else
        worksheetPart.Worksheet.Append(conditionalFormatting);

    //add the differential formats to the stylesheet if it didn't already exist
    if (addDifferentialFormats)
        stylesPart.Stylesheet.Append(differentialFormats);
}

请注意，OpenXml 对元素的顺序很挑剔，因此（尤其是在处理现有文档时）您需要确保在树中的正确位置添加元素。