Question

我在内存中有一个excel字符串（我建立了）;代码看起来像这样：

public static void exportToExcel()
        {
            const string startExcelXML = "<xml version>\r\n<Workbook " +
                  "xmlns=\"urn:schemas-microsoft-com:office:spreadsheet\"\r\n"
+
                  " xmlns:o=\"urn:schemas-microsoft-com:office:office\"\r\n " +
                  "xmlns:x=\"urn:schemas-    microsoft-com:office:" +
                  "excel\"\r\n xmlns:ss=\"urn:schemas-microsoft-com:"
+
                  "office:spreadsheet\">\r\n <Styles>\r\n " +
                  "<Style ss:ID=\"Default\" ss:Name=\"Normal\">\r\n " +
                  "<Alignment ss:Vertical=\"Bottom\"/>\r\n <Borders/>" +
                  "\r\n <Font/>\r\n <Interior/>\r\n <NumberFormat/>" +
                  "\r\n <Protection/>\r\n </Style>\r\n " +
                  "<Style ss:ID=\"BoldColumn\">\r\n <Font " +
                  "x:Family=\"Swiss\" ss:Bold=\"1\"/>\r\n </Style>\r\n " +
                  "<Style     ss:ID=\"StringLiteral\">\r\n <NumberFormat" +
                  " ss:Format=\"@\"/>\r\n </Style>\r\n <Style " +
                  "ss:ID=\"Decimal\">\r\n <NumberFormat/>\r\n </Style>\r\n " +
                  "<Style ss:ID=\"Integer\">\r\n <NumberFormat "
+
                  "ss:Format=\"0\"/>\r\n </Style>\r\n <Style " +
                  "ss:ID=\"DateLiteral\">\r\n <NumberFormat " +
                  "ss:Format=\"dd/mm/yyyy;@\"/>\r\n </Style>\r\n " +
                  "</Styles>\r\n ";
            const string endExcelXML = "</Workbook>";

            int sheetCount = 1;
            StringBuilder sb = new StringBuilder();

            sb.Append(startExcelXML);
            sb.Append("<Worksheet ss:Name=\"Sheet" + sheetCount + "\">");
            sb.Append("<Table>");
            sb.Append("<Row>");
            sb.Append("<Cell ss:StyleID=\"BoldColumn\"><Data ss:Type=\"String\">");
            sb.Append("Home country");
            sb.Append("</Data></Cell>");
            sb.Append("<Cell ss:StyleID=\"BoldColumn\"><Data ss:Type=\"String\">");
            sb.Append("Expatriation Type");
            sb.Append("</Data></Cell>");
            sb.Append("</Row>");
            sb.Append("<Row>");
     sb.Append("<Cell ss:StyleID=\"StringLiteral\">" +
      "<Data ss:Type=\"String\">");
     sb.Append("Singapore");
     sb.Append("</Data></Cell>");
     sb.Append("<Cell ss:StyleID=\"StringLiteral\">" +
      "<Data ss:Type=\"String\">");
     sb.Append("Benchmark");
     sb.Append("</Data></Cell>");
            sb.Append("</Row>");
            sb.Append("</Table>");
            sb.Append(" </Worksheet>");
            sb.Append(endExcelXML);
        }

只有在物理上保存文件时才能以excel表格打开文件;但有没有其他方法可以从内存中打开xml字符串作为excel表？

Answer 1

我认为您需要的是某种内存映射文件实现。

但我相信，.NET 4.0将内置MemoryMappedFile支持。

您可以使用搜索引擎找到其他.net实现。

Answer 2

我不确定，但大多数Microsoft自动化对象支持IPersist or IPersistStream，这可能允许您从内存中加载流。

像（伪代码）：

xl = new Office.ExcelApplication;
(xl as IPersistStream).Load(myMemoryStream);

您可以使用shell帮助函数CreateStreamOnHGlobal在某些内存周围创建一个IStream包装器：

functionCreateStreamOnMemory(pData: Pointer; nCount: DWORD): IStream;
var
    hMem: HGLOBAL;
    dwError: DWORD;
    p: Pointer;
begin
    hMem := GlobalAlloc(GMEM_MOVEABLE or GMEM_NODISCARD, nCount); 
       //CreateStreamOnHGlobal says "The handle must be 
       //allocated as movable and nondiscardable."
    if hMem = 0 then
        RaiseLastWin32Error;

    p := GlobalLock(hMem);
    if p = nil then
    begin
        dwError := GetLastError;
        GlobalFree(hMem);
        raise EWin32Error.Create('Could not lock global memory object: '+SysErrorMessage(dwError));
    end;
    try
        CopyMemory(p, pData, nCount);
    finally
        GlobalUnlock(hMem);
    end;

    OleCheck(CreateStreamOnHGlobal(hMem, True, Result)); //Because we pass True, the stream will take care of freeing the HGLOBAL when the stream is released
end;

将您的字符串填入内存并查看它是否已加载。

在内存中打开XML字符串作为Excel工作簿而不使用Windows窗体C保存＃

2 个答案: