知识大全 C#中datatabel导出excel(三种方法)

Posted 2022-07-18 知

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　　方法一 (拷贝直接可以使用适合大批量资料上万笔)Microsoft Office Interop Excel Application appexcel = new Microsoft Office Interop Excel Application();SaveFileDialog savefiledialog = new SaveFileDialog();System Reflection Missing miss = System Reflection Missing Value;appexcel = new Microsoft Office Interop Excel Application();Microsoft Office Interop Excel Workbook workbookdata;Microsoft Office Interop Excel Worksheet worksheetdata;Microsoft Office Interop Excel Range rangedata;//设置对象不可见appexcel Visible = false;System Globalization CultureInfo currentci = System Threading Thread CurrentThread CurrentCulture;System Threading Thread CurrentThread CurrentCulture = new System Globalization CultureInfo( en us );workbookdata = appexcel Workbooks Add(miss);worksheetdata = (Microsoft Office Interop Excel Worksheet)workbookdata Worksheets Add(miss miss miss miss);//给工作表赋名称worksheetdata Name = saved ;for (int i = ; i < dt Columns Count; i++) worksheetdata Cells[ i + ] = dt Columns[i] ColumnName ToString();//因为第一行已经写了表头所以所有数据都应该从a 开始rangedata = worksheetdata get_Range( a miss);Microsoft Office Interop Excel Range xlrang = null;//irowcount为实际行数最大行int irowcount = dt Rows Count;int iparstedrow = icurrsize = ;//ieachsize为每次写行的数值可以自己设置int ieachsize = ;//icolumnaccount为实际列数最大列数int icolumnaccount = dt Columns Count;//在内存中声明一个ieachsize×icolumnaccount的数组 ieachsize是每次最大存储的行数 icolumnaccount就是存储的实际列数object[ ] objval = new object[ieachsize icolumnaccount];icurrsize = ieachsize;

　　while (iparstedrow < irowcount) if ((irowcount iparstedrow) < ieachsize) icurrsize = irowcount iparstedrow; //用for循环给数组赋值 for (int i = ; i < icurrsize; i++) for (int j = ; j < icolumnaccount; j++) objval[i j] = dt Rows[i + iparstedrow][j] ToString(); System Windows Forms Application DoEvents(); string X = A + ((int)(iparstedrow + )) ToString(); string col = ; if (icolumnaccount <= ) col = ((char)( A + icolumnaccount )) ToString() + ((int)(iparstedrow + icurrsize + )) ToString(); else col = ((char)( A + (icolumnaccount / ))) ToString() + ((char)( A + (icolumnaccount % ))) ToString() + ((int)(iparstedrow + icurrsize + )) ToString(); xlrang = worksheetdata get_Range(X col); // 调用range的value 属性把内存中的值赋给excel xlrang Value = objval; iparstedrow = iparstedrow + icurrsize;//保存工作表System Runtime InteropServices Marshal ReleaseComObject(xlrang);xlrang = null;//调用方法关闭excel进程appexcel Visible = true;

　　方法二 (自己建函数适合大批量资料上万笔)using System IO;private void dataTableToCsv(DataTable table string file) string title = ; FileStream fs = new FileStream(file FileMode OpenOrCreate); //FileStream fs = File Open(file FileMode Open FileAccess Read); StreamWriter sw = new StreamWriter(new BufferedStream(fs) System Text Encoding Default); for (int i = ; i < table Columns Count; i++) title += table Columns[i] ColumnName + \\t ; //栏位自动跳到下一单元格 title = title Substring( title Length ) + \\n ; sw Write(title); foreach (DataRow row in table Rows) string line = ; for (int i = ; i < table Columns Count; i++) line += row[i] ToString() Trim() + \\t ; //内容自动跳到下一单元格 line = line Substring( line Length ) + \\n ; sw Write(line); sw Close(); fs Close();dataTableToCsv(dt @ c:\\ xls ); //调用函数System Diagnostics Process Start(@ c:\\ xls ); //打开excel文件

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