无法将System.IO.Stream隐式转换为System.IO.MemoryStream。 C＃

Question

此代码用于在VB中工作，无法查明我在这里缺少什么。

System.IO.MemoryStream oStream = new System.IO.MemoryStream();

if (rptName == "rpt_BankFormatExCopy.rpt" | rptName == "GIS_reportExFormat.rpt" | rptName == "GPFDeductionRepExFormat.rpt")
    oStream = rptObject.ExportToStream(CrystalDecisions.Shared.ExportFormatType.ExcelRecord);
else
    oStream = rptObject.ExportToStream(CrystalDecisions.Shared.ExportFormatType.Excel);

Answer 1

看起来rptObject是Stream

在这种情况下，您可以只使用CopyTo

var oStream = new MemoryStream();
Stream stream = null;

if (rptName == "rpt_BankFormatExCopy.rpt" | rptName == "GIS_reportExFormat.rpt" | rptName == "GPFDeductionRepExFormat.rpt")
    stream = rptObject.ExportToStream(CrystalDecisions.Shared.ExportFormatType.ExcelRecord);
else
    stream = rptObject.ExportToStream(CrystalDecisions.Shared.ExportFormatType.Excel);

stream.CopyTo(oStream);