针对“C#对Excel文件模板的完全读取”这样的一个题目，其实好像描述得不大对。在此再描述下：

如下代码主要是通过对一个Excel模板文件的读取，然后再想模板中填入对应的数据之后，另存为一个新的Excel文件。此文件完全符合原模板要求。（因为原Excel是带有很多样式和公式的，单独只提取原Excel的数值，是很难符合具体工作的需求的。）

源码：

需添加引用：using Excel = Microsoft.Office.Interop.Excel;

        private void insertDataToExcel( string templateFilePath,ArrayList sourceData,string excelColumnName) //undo,no test
        {
            Excel.Application myExcelApp;
            Excel.Workbooks myExcelWorkbooks;
            Excel.Workbook myExcelWorkbook;


            object misValue = System.Reflection.Missing.Value;

            myExcelApp = new Excel.Application();
            myExcelApp.Visible = false;
            myExcelWorkbooks = myExcelApp.Workbooks;
            String fileName = @"C:\AutomationReport\a1.xlsx";
            String fileName2 = @"C:\AutomationReport\a4.xlsx";
            // set this to your file you want
            //myExcelWorkbook = myExcelWorkbooks.OpenDatabase(fileName, misValue, misValue, misValue, misValue);
            myExcelWorkbook = myExcelWorkbooks.Open(fileName, misValue, misValue, misValue, misValue, misValue, misValue, misValue, misValue, misValue, misValue, misValue, misValue, misValue, misValue);

            Excel.Worksheet myExcelWorksheet = (Excel.Worksheet)myExcelWorkbook.ActiveSheet;

            myExcelWorksheet.get_Range("A1", misValue).Formula = "3";
            myExcelWorksheet.get_Range("A2", misValue).Formula = "2";

            myExcelWorkbook.SaveAs(fileName2, Microsoft.Office.Interop.Excel.XlFileFormat.xlWorkbookDefault, misValue, misValue, misValue, misValue, Excel.XlSaveAsAccessMode.xlNoChange, misValue, misValue, misValue, misValue, misValue);
            myExcelWorkbook.Close();
        }

C#对Excel文件模板的完全读取