1. 调用Excel的COM组件。
在项目中打开Add Reference对话框,选择COM栏,之后在COM列表中找到"Microsoft Excel 11.0 Object Library"(Office 2003),然后将其加入到项目的References中即可。Visual C#.NET会自动产生相应的.NET组件文件,以后即可正常使用。
2. 打开Excel表格
Excel.Application excel = new Excel.Application(); //引用Excel对象
Excel.Workbook book = excel.Application.Workbooks.Add(Missing.Value); //引用Excel工作簿
excel.Visible = bVisible; //使Excel可视
有时调用excel.Application.Workbooks.Add(Missing.Value)会遇到如下错误:
Exception:
Old format or invalid type library. (Exception from HRESULT: 0x80028018 (TYPE_E_INVDATAREAD))
这是Excel自身的一个bug,当本地系统环境被设置成非英文的,而Excel是英文的时候,就会出现,需要临时设定英文环境,代码如下:
System.Globalization.CultureInfo CurrentCI = System.Threading.Thread.CurrentThread.CurrentCulture;
System.Threading.Thread.CurrentThread.CurrentCulture = new System.Globalization.CultureInfo("en-US");
3. 往Excel表格中插入数据
Excel.Worksheet sheet = (Excel.Worksheet)book.Worksheets["Sheet1"]; // 选中当前新建Sheet(一般为Sheet1)
有两种插入方法
a. 逐格插入数据
sheet.Cells[iRow, iCol] = value; // 左上角第一格的坐标是[1, 1]
b. 按块插入数据
object[,] objVal = new object[Height, Length];
// 设置数据块
Excel.Range range = sheet.get_Range(sheet.Cells[iRow, iCol], sheet.Cells[iRow + Height, iCol + Length])
range.Value2 = objVal;
4. 清理内存和恢复环境
System.Runtime.InteropServices.Marshal.ReleaseComObject(range);
System.Runtime.InteropServices.Marshal.ReleaseComObject(sheet);
System.Runtime.InteropServices.Marshal.ReleaseComObject(book);
while (System.Runtime.InteropServices.Marshal.ReleaseComObject(excel) > 0) ;
range = null;
sheet = null;
book = null;
excel = null;
GC.Collect();
System.Threading.Thread.CurrentThread.CurrentCulture = CurrentCI;