C#下如何通过不添加对Office的引用,而创建Excel对象
添加命名空间: using System.Reflection;
///
/// 将DataGridView中的数据打印出来
///
/// 接收的消息常量
public void CmDbGridEhDataPrint(ref System.Windows.Forms.Message m) //CM_DBGRIDEH_DATA_PRINT
{
object ObjApp;
object ObjBook;
object ObjBooks;
object ObjSheets;
object ObjSheet;
object[] Arg1, Arg2, Arg3, Arg4, Arg5;
int I, J, K;
object Cells1;
System.Data.DataTable MyTable = null;
DataGridView obj;
if (!(ActiveControl is DataGridView))
{
return;
}
else
{
obj = (DataGridView)ActiveControl;
//反射取得类型
Type ObjExcel = Type.GetTypeFromProgID("Excel.Application");
if (ObjExcel == null)
{
SysPublicTools.DJShow("请先安装Excel97/2000。", 1);
return;
}
try
{
//创建Excel实例
ObjApp = Activator.CreateInstance(ObjExcel);
//设置可见属性
ObjApp.GetType().InvokeMember("Visible", BindingFlags.SetProperty, Type.DefaultBinder, ObjApp, new object[] { "True"});
ObjApp.GetType().InvokeMember("UserControl", BindingFlags.SetProperty, Type.DefaultBinder, ObjApp, new object[] { "True" });
//获取Workbook集
ObjBooks = ObjApp.GetType().InvokeMember("Workbooks", BindingFlags.GetProperty, Type.DefaultBinder, ObjApp, null);
//添加一个新的Workbook
ObjBook = ObjBooks.GetType().InvokeMember("Add", BindingFlags.InvokeMethod, Type.DefaultBinder, ObjBooks, null);
//获取Sheet集
ObjSheets = ObjBook.GetType().InvokeMember("Worksheets", BindingFlags.GetProperty, Type.DefaultBinder, ObjBook, null);
//获取第一个Sheet对象
Arg1 = new object[1] { 1 };
ObjSheet = ObjSheets.GetType().InvokeMember("Item", BindingFlags.GetProperty, Type.DefaultBinder, ObjSheets, Arg1);
Arg2 = new object[2] { 1, 1 };
Cells1 = ObjSheet.GetType().InvokeMember("Cells", BindingFlags.GetProperty, Type.DefaultBinder, ObjSheet, Arg2);
Cells1.GetType().InvokeMember("Value2", BindingFlags.SetProperty, Type.DefaultBinder, Cells1, new Object[] { "shubozhong博客" });
Arg3 = new object[2] { 2, 1 };
Cells1 = ObjSheet.GetType().InvokeMember("Cells", BindingFlags.GetProperty, Type.DefaultBinder, ObjSheet, Arg3);
Cells1.GetType().InvokeMember("Value2", BindingFlags.SetProperty, Type.DefaultBinder, Cells1, new Object[] { this.Text });
J = 1;
for (I = 0; I < obj.ColumnCount; I++)
{
if (!obj.Columns[I].Visible)
{
continue;
}
else
{
Arg4 = new object[2] { 3, J };
Cells1 = ObjSheet.GetType().InvokeMember("Cells", BindingFlags.GetProperty, Type.DefaultBinder, ObjSheet, Arg4);
Cells1.GetType().InvokeMember("Value2", BindingFlags.SetProperty, Type.DefaultBinder, Cells1, new Object[] { obj.Columns[I].HeaderText });
J = J + 1;
}
}
if (obj.DataSource != null)
{
if (obj.DataSource is System.Data.DataTable)
{
MyTable = (System.Data.DataTable)obj.DataSource;
}
else
{
if (obj.DataSource is BindingSource)
{
BindingSource bs = (BindingSource)obj.DataSource;
MyTable = (System.Data.DataTable)bs.DataSource;
}
}
}
K = 4;
if (MyTable != null)
{
if (MyTable.Rows.Count > 0)
{
foreach (DataRow NewRow in MyTable.Rows)
{
J = 0;
for (I = 0; I < obj.Columns.Count; I++)
{
J++;
if (!(obj.Columns[I].Visible))
{
J--;
continue;
}
else
{
if (MyTable.Columns[I].ToString().Length != 0)
{
Arg5 = new object[2] { K, J };
Cells1 = ObjSheet.GetType().InvokeMember("Cells", BindingFlags.GetProperty, Type.DefaultBinder, ObjSheet, Arg5);
Cells1.GetType().InvokeMember("Value2", BindingFlags.SetProperty, Type.DefaultBinder, Cells1, new Object[] { NewRow.ItemArray[I].ToString() });
}
}
}
K = K + 1;
}
}
}
//ObjApp.GetType().InvokeMember("Quit",BindingFlags.InvokeMethod,Type.DefaultBinder,ObjApp,null);
}
catch (Exception err)
{
SysPublicTools.DJShow("创建Excel文件失败,请检查Office软件是否已经正确安装!"+err.Message, 1);
}
}
}
上面的代码中,关键的就是用到的 Type.GetType().InvokeMember(),这个方法对于调用是否成功,起着很重要的作用.