C#中DataGridView导出Excel的两种方法
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2022-04-27 15:05:29
第一种是用数据流导出:#region savefiledialog savefiledialog = new savefiledialog(); savefiledialog.fi...
第一种是用数据流导出:
#region savefiledialog savefiledialog = new savefiledialog(); savefiledialog.filter = "execl files (*.xls)|*.xls"; savefiledialog.filterindex = 0; savefiledialog.restoredirectory = true; savefiledialog.createprompt = true; savefiledialog.title = "export excel file"; savefiledialog.showdialog(); if (savefiledialog.filename == "") return; stream mystream; mystream = savefiledialog.openfile(); streamwriter sw = new streamwriter(mystream, system.text.encoding.getencoding(-0)); string str = ""; try { for (int i = 0; i < datagridview1.columncount; i++) { if (i > 0) { str += "\t"; } str += datagridview1.columns[i].headertext; } sw.writeline(str); for (int j = 0; j < datagridview1.rows.count; j++) { string tempstr = ""; for (int k = 0; k < datagridview1.columns.count; k++) { if (k > 0) { tempstr += "\t"; } tempstr += datagridview1.rows[j].cells[k].value.tostring(); } sw.writeline(tempstr); } sw.close(); mystream.close(); } catch (exception ex) { //messagebox.show(ex.tostring()); } finally { sw.close(); mystream.close(); } #endregion
这种方法的优点就是导出比较快,但是excel的表格里面设置标题,字体样式等都不能弄,因为你是用数据流直接导出为excel的,除非你能在数据流中设置这些样式,这个我还没这本事,哪位大哥会的教一下...嘿嘿
第二种方法是直接写一个类,这个类直接操作excel的:
using system; using system.collections.generic; using system.windows.forms; using system.text; using system.diagnostics; using system.io; using microsoft.office.interop.excel; namespace excel { public class export { /// <summary> /// datagridview导出excel /// </summary> /// <param name="strcaption">excel文件中的标题</param> /// <param name="mydgv">datagridview 控件</param> /// <returns>0:成功;1:datagridview中无记录;2:excel无法启动;9999:异常错误</returns> public int exportexcel(string strcaption, datagridview mydgv, savefiledialog savefiledialog) { int result = 9999; //保存 savefiledialog.filter = "execl files (*.xls)|*.xls"; savefiledialog.filterindex = 0; savefiledialog.restoredirectory = true; //savefiledialog.createprompt = true; savefiledialog.title = "export excel file"; if ( savefiledialog.showdialog()== dialogresult.ok) { if (savefiledialog.filename == "") { messagebox.show("请输入保存文件名!"); savefiledialog.showdialog(); } // 列索引,行索引,总列数,总行数 int colindex = 0; int rowindex = 0; int colcount = mydgv.columncount; int rowcount = mydgv.rowcount; if (mydgv.rowcount == 0) { result = 1; } // 创建excel对象 microsoft.office.interop.excel.application xlapp = new microsoft.office.interop.excel.applicationclass(); if (xlapp == null) { result = 2; } try { // 创建excel工作薄 microsoft.office.interop.excel.workbook xlbook = xlapp.workbooks.add(true); microsoft.office.interop.excel.worksheet xlsheet = (microsoft.office.interop.excel.worksheet)xlbook.worksheets[1]; // 设置标题 microsoft.office.interop.excel.range range = xlsheet.get_range(xlapp.cells[1, 1], xlapp.cells[1, colcount]); //标题所占的单元格数与datagridview中的列数相同 range.mergecells = true; xlapp.activecell.formular1c1 = strcaption; xlapp.activecell.font.size = 20; xlapp.activecell.font.bold = true; xlapp.activecell.horizontalalignment = microsoft.office.interop.excel.constants.xlcenter; // 创建缓存数据 object[,] objdata = new object[rowcount + 1, colcount]; //获取列标题 foreach (datagridviewcolumn col in mydgv.columns) { objdata[rowindex, colindex++] = col.headertext; } // 获取数据 for (rowindex = 1; rowindex < rowcount; rowindex++) { for (colindex = 0; colindex < colcount; colindex++) { if (mydgv[colindex, rowindex - 1].valuetype == typeof(string) || mydgv[colindex, rowindex - 1].valuetype == typeof(datetime))//这里就是验证datagridview单元格中的类型,如果是string或是datatime类型,则在放入缓存时在该内容前加入" "; { objdata[rowindex, colindex] = "" + mydgv[colindex, rowindex - 1].value; } else { objdata[rowindex, colindex] = mydgv[colindex, rowindex - 1].value; } } system.windows.forms.application.doevents(); } // 写入excel range = xlsheet.get_range(xlapp.cells[2, 1], xlapp.cells[rowcount, colcount]); range.value2 = objdata; xlbook.saved = true; xlbook.savecopyas(savefiledialog.filename); } catch (exception err) { result = 9999; } finally { xlapp.quit(); gc.collect(); //强制回收 } //返回值 result = 0; } return result; } } }
这个优点是能设置样式什么的。缺点就是导出速度慢...
以上两种方法都是参考了很多料的..写在这里以便于相互学习..
补充一下:用第二种方法导出excel会有格式方面的变化,比如身份证号码按科学计算法导出了,不是按原先的模型
改进方法是在写入excel时添加一个格式声明:range.numberformatlocal = "@";
如:// 写入excel
range = xlsheet.get_range(xlapp.cells[2, 1], xlapp.cells[rowcount + 2, colcount]); range.numberformatlocal = "@"; range.value2 = objdata;
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