在内存中作为Excel工作簿在内存中打开而不保存使用Windows窗体C＃

Question

我在内存中有一个excel字符串（我构建）;代码看起来是这样的：

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); 
     } 

我能够打开该文件，因为只有当我保存物理文件excel表;但有没有其他的方式来打开内存中的XML字符串作为Excel表？

Answer 1

我认为你需要的是某种内存映射文件的实现。

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

我并不确定，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的流加载。

类似的信息（伪代码）：

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

您可以使用shell辅助函数CreateStreamOnHGlobal创建一个围绕一些内存的IStream包装：

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; 

的东西你在存储串和看看它是否加载。