C# 使用自定义FileResult输出在NPOI库中创建的工作簿
我创建了一个ASP.NET Mvc自定义C# 使用自定义FileResult输出在NPOI库中创建的工作簿,c#,asp.net-mvc,xlsx,npoi,fileresult,C#,Asp.net Mvc,Xlsx,Npoi,Fileresult,我创建了一个ASP.NET Mvc自定义文件结果,它将导出工作簿(.xlsx) 请参见以下代码: public class TestData { public string StudentName { get; set; } public string Course { get; set; } } public class ExcelResult<T> : FileResult { private readonly List<TestData>
文件结果
,它将导出工作簿(.xlsx
)
请参见以下代码:
public class TestData
{
public string StudentName { get; set; }
public string Course { get; set; }
}
public class ExcelResult<T> : FileResult
{
private readonly List<TestData> _testDataList;
public ExcelResult(string fileName = "export.xlsx")
: base("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet")
{
FileDownloadName = fileName;
List<TestData> testDataList = new List<TestData>();
TestData td = new TestData();
TestData td1 = new TestData();
td.StudentName = "Student1";
td.Course = "BS IT";
td1.StudentName = "Student2";
td1.Course = "BS IT";
testDataList.Add(td);
testDataList.Add(td1);
_testDataList = testDataList;
}
protected override void WriteFile(HttpResponseBase response)
{
Stream output = response.OutputStream;
// create an Excel file objects
XSSFWorkbook workbook = new XSSFWorkbook();
// add a Sheet
ISheet sheet1 = workbook.CreateSheet("Sheet1");
// get list data
List<TestData> listRainInfo = _testDataList;
// to sheet1 add the title of the first head row
IRow row1 = sheet1.CreateRow(0);
row1.CreateCell(0).SetCellValue("Student Name");
row1.CreateCell(1).SetCellValue("Course");
// data is gradually written sheet1 each row
for (int i = 0; i < listRainInfo.Count; i++)
{
IRow rowtemp = sheet1.CreateRow(i + 1);
rowtemp.CreateCell(0).SetCellValue(listRainInfo[i].StudentName.ToString());
rowtemp.CreateCell(1).SetCellValue(listRainInfo[i].Course.ToString());
}
// Write to the client
MemoryStream ms = new MemoryStream();
workbook.Write(ms);
output.Write(ms.GetBuffer(), 0, (int)ms.Length);
}
}
公共类TestData
{
公共字符串StudentName{get;set;}
公共字符串课程{get;set;}
}
公共类ExcelResult:FileResult
{
私有只读列表_testDataList;
public ExcelResult(字符串fileName=“export.xlsx”)
:base(“application/vnd.openxmlformats of cedocument.spreadsheetml.sheet”)
{
FileDownloadName=文件名;
List testDataList=新列表();
TestData td=新的TestData();
TestData td1=新的TestData();
td.StudentName=“Student1”;
td.Course=“BS IT”;
td1.StudentName=“Student2”;
td1.Course=“BS IT”;
testDataList.Add(td);
testDataList.Add(td1);
_testDataList=testDataList;
}
受保护的重写无效写文件(HttpResponseBase响应)
{
流输出=response.OutputStream;
//创建Excel文件对象
XSSFWorkbook工作簿=新XSSFWorkbook();
//添加工作表
ISheet sheet1=工作簿.CreateSheet(“sheet1”);
//获取列表数据
List listRainInfo=\u testDataList;
//在图纸1中添加第一行标题
IRow row1=sheet1.CreateRow(0);
行1.CreateCell(0.SetCellValue(“学生名”);
行1.CreateCell(1.SetCellValue(“课程”);
//数据逐渐写入每行1页
for(int i=0;i
在这行代码中,它抛出错误(无法访问封闭流):output.Write(ms.GetBuffer(),0,(int)ms.Length)代码>
我是不是遗漏了什么?我只是想知道出了什么问题。出于某种原因,一旦我在流中完成工作簿的编写,它就会将其关闭
因此,要使代码正常工作,我们需要这样做:
MemoryStream ms = new MemoryStream();
workbook.Write(ms);
var buffer = ms.ToArray();
var bytesRead = buffer.Length;
然后我们现在可以将其传递给客户端:
response.OutputStream.Write(buffer, 0, btyesRead);