使用C#和Excel进行报表开发（八）－用程序绑定数据源

先制作一个简单的Excel文件作为模板，为了防止要填充的Cell中的内容和标题的内容一样，所以要填充内容的Cell中的内容是“$” + 字段名(要和DataTable中的列名一致），效果如图：



创建一个Winform程序，给窗体上添加两个按钮，代码分别为：
创建Xml：


private void button1_Click(object sender, EventArgs e)






{


DataColumn dcName = new DataColumn("name", typeof(string));


DataColumn dcAge = new DataColumn("age", typeof(int));


DataColumn dcMemo = new DataColumn("memo", typeof(string));




DataTable dt = new DataTable();


dt.Columns.Add(dcName);


dt.Columns.Add(dcAge);


dt.Columns.Add(dcMemo);




DataRow dr = dt.NewRow();


dr["name"] = "dahuzizyd";


dr["age"] = "20";


dr["memo"] = "dahuzizyd.cnblogs.com";




dt.Rows.Add(dr);


dt.AcceptChanges();




DataSet ds = new DataSet();


ds.Tables.Add(dt);




ds.WriteXml(Application.StartupPath +"//ExcelBindingXml.xml");






}

提取xml并且加载到Excel模板上，再另存：


private void button2_Click(object sender, EventArgs e)






{


DataSet ds = new DataSet();


ds.ReadXml(Application.StartupPath + "//ExcelBindingXml.xml");




Excel.Application m_objExcel = null;




Excel._Workbook m_objBook = null;




Excel.Sheets m_objSheets = null;




Excel._Worksheet m_objSheet = null;




Excel.Range m_objRange = null;




object m_objOpt = System.Reflection.Missing.Value;




try






{




m_objExcel = new Excel.Application();


m_objBook = m_objExcel.Workbooks.Open(Application.StartupPath + "//ExcelTemplate.xls", m_objOpt, m_objOpt, m_objOpt, m_objOpt, m_objOpt, m_objOpt, m_objOpt, m_objOpt, m_objOpt, m_objOpt, m_objOpt, m_objOpt, m_objOpt, m_objOpt);


m_objSheets = (Excel.Sheets)m_objBook.Worksheets;


m_objSheet = (Excel._Worksheet)(m_objSheets.get_Item(1));




foreach (DataRow dr in ds.Tables[0].Rows)






{


for (int col = 0; col < ds.Tables[0].Columns.Count; col++)






{


for (int excelcol = 1; excelcol < 8; excelcol++)






{


for (int excelrow = 1; excelrow < 5; excelrow++)






{


string excelColName = ExcelColNumberToColText(excelcol);




m_objRange = m_objSheet.get_Range(excelColName + excelrow.ToString(), m_objOpt);




if ( m_objRange.Text.ToString().Replace("$","") == ds.Tables[0].Columns[col].ColumnName )






{


m_objRange.Value2 = dr[col].ToString();


}


}




}


}


}




m_objExcel.DisplayAlerts = false;


m_objBook.SaveAs(Application.StartupPath + "//ExcelBindingXml.xls", m_objOpt, m_objOpt,


m_objOpt, m_objOpt, m_objOpt, Excel.XlSaveAsAccessMode.xlNoChange,




m_objOpt, m_objOpt, m_objOpt, m_objOpt, m_objOpt);




}


catch (Exception ex)






{


MessageBox.Show(ex.Message);


}


finally






{


m_objBook.Close(m_objOpt, m_objOpt, m_objOpt);


m_objExcel.Workbooks.Close();


m_objExcel.Quit();


System.Runtime.InteropServices.Marshal.ReleaseComObject(m_objBook);


System.Runtime.InteropServices.Marshal.ReleaseComObject(m_objExcel);


m_objBook = null;


m_objExcel = null;


GC.Collect();


}


}

下面是一个辅助函数，主要是将整数的列序号转换到Excel用的以字母表示的列号，Excel最大列数为255。


private string ExcelColNumberToColText(int colNumber)






{


string colText = "";




int colTextLength = colNumber / 26;


int colTextLast = colNumber % 26;




if (colTextLast != 0)






{


switch (colTextLength)






{


case 0: break;


case 1: colText = "A"; break;


case 2: colText = "B"; break;


case 3: colText = "C"; break;


case 4: colText = "D"; break;


case 5: colText = "E"; break;


case 6: colText = "F"; break;


case 7: colText = "G"; break;


case 8: colText = "H"; break;


case 9: colText = "I"; break;


default: break;


}


}


else






{


switch (colTextLength)






{


case 1: colText = ""; break;


case 2: colText = "A"; break;


case 3: colText = "B"; break;


case 4: colText = "C"; break;


case 5: colText = "D"; break;


case 6: colText = "E"; break;


case 7: colText = "F"; break;


case 8: colText = "G"; break;


case 9: colText = "H"; break;


default: break;


}


}




switch (colTextLast)






{


case 0:colText = colText + "Z"; break;


case 1: colText = colText + "A"; break;


case 2: colText = colText + "B"; break;


case 3: colText = colText + "C"; break;


case 4: colText = colText + "D"; break;


case 5: colText = colText + "E"; break;


case 6: colText = colText + "F"; break;


case 7: colText = colText + "G"; break;


case 8: colText = colText + "H"; break;


case 9: colText = colText + "I"; break;


case 10: colText = colText + "J"; break;


case 11: colText = colText + "K"; break;


case 12: colText = colText + "L"; break;


case 13: colText = colText + "M"; break;


case 14: colText = colText + "N"; break;


case 15: colText = colText + "O"; break;


case 16: colText = colText + "P"; break;


case 17: colText = colText + "Q"; break;


case 18: colText = colText + "R"; break;


case 19: colText = colText + "S"; break;


case 20: colText = colText + "T"; break;


case 21: colText = colText + "U"; break;


case 22: colText = colText + "V"; break;


case 23: colText = colText + "W"; break;


case 24: colText = colText + "X"; break;


case 25: colText = colText + "Y"; break;




default: break;


}




return colText;


}

运行完成后，生成的Excel如下图：