C# 创建Excel并写入内容

1 增加应用      Microsoft.Office.Interop.Excel
2 引用命名空间  using Excel = Microsoft.Office.Interop.Excel;
/// <summary>
/// If the supplied excel File does not exist then Create it
/// </summary>
/// <param name="FileName"></param>
private void CreateExcelFile(string FileName)
{
//create
object Nothing = System.Reflection.Missing.Value;
var app = new Excel.Application();
app.Visible = false;
Excel.Workbook workBook = app.Workbooks.Add(Nothing);
Excel.Worksheet worksheet = (Excel.Worksheet)workBook.Sheets[1];
worksheet.Name = "Work";
//headline
worksheet.Cells[1, 1] = "FileName";
worksheet.Cells[1, 2] = "FindString";
worksheet.Cells[1, 3] = "ReplaceString";

worksheet.SaveAs(FileName, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Excel.XlSaveAsAccessMode.xlNoChange, Type.Missing, Type.Missing, Type.Missing);
workBook.Close(false, Type.Missing, Type.Missing);
app.Quit();
}

/// <summary>
/// open an excel file,then write the content to file
/// </summary>
/// <param name="FileName">file name</param>
/// <param name="findString">first cloumn</param>
/// <param name="replaceString">second cloumn</param>
private void WriteToExcel(string excelName,string filename,string findString,string replaceString)
{
//open
object Nothing = System.Reflection.Missing.Value;
var app = new Excel.Application();
app.Visible = false;
Excel.Workbook mybook = app.Workbooks.Open(excelName, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing);
Excel.Worksheet mysheet = (Excel.Worksheet)mybook.Worksheets[1];
mysheet.Activate();
//get activate sheet max row count
int maxrow = mysheet.UsedRange.Rows.Count + 1;
mysheet.Cells[maxrow, 1] = filename;
mysheet.Cells[maxrow, 2] = findString;
mysheet.Cells[maxrow, 3] = replaceString;
mybook.Save();
mybook.Close(false, Type.Missing, Type.Missing);
mybook = null;
//quit excel app
app.Quit();
}