public Excel.Range range { get; set; }
该类的构造函数调用此方法：
private void OpenWorkBook()
{
string str;
int rCnt = 0;
int cCnt = 0;
xlApp = new Excel.ApplicationClass();
xlWorkBook = xlApp.Workbooks.Open(MasterFileName, 0, true, 5, "", "", true,
Microsoft.Office.Interop.Excel.XlPlatform.xlWindows,
"\t", false, false, 0, true, 1, 0);
xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1);
range = xlWorkSheet.UsedRange;
}
之后我从另一种方法引用range：
public void CreateFiles(string column)
{
try
{
var valueRange = range.get_Range(column + "3", column + range.Rows.Count.ToString());
var deleteRange = range;
我得到了：
valueRange threw an exception of type System.Runtime.InteropServices.InvalidComObjectException'
有谁知道为什么我要丢失这个变量的内容？
这是我的完整代码：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using Excel = Microsoft.Office.Interop.Excel;
using System.Runtime.InteropServices;
using System.Runtime.Serialization;
namespace EmailSalesVolumeSolution
{
class WorkBook
{
public string MasterFileName { get; set; }
public string[] DistinctEmails { get; set; }
public Excel.Application xlApp {get;set;}
public Excel.Workbook xlWorkBook { get; set; }
public Excel.Worksheet xlWorkSheet { get; set; }
public Excel.Range range { get; set; }
private void OpenWorkBook()
{
string str;
int rCnt = 0;
int cCnt = 0;
xlApp = new Excel.ApplicationClass();
xlWorkBook = xlApp.Workbooks.Open(MasterFileName, 0, true, 5, "", "", true,
Microsoft.Office.Interop.Excel.XlPlatform.xlWindows,
"\t", false, false, 0, true, 1, 0);
xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1);
range = xlWorkSheet.UsedRange;
}
public WorkBook(string filename)
{
MasterFileName = filename;
//xlWorkBook = null;
//xlApp = null;
//xlWorkSheet = null;
//range = null;
OpenWorkBook();
}
public void SendEmail()
{
}
public void CreateFiles(string column)
{
try
{
var valueRange = range.get_Range(column + "3", column + range.Rows.Count.ToString());
var deleteRange = range;
string cell = "";
DistinctEmails = DistinctValues(valueRange);
foreach (string email in DistinctEmails)
{
for (int rCnt = 2; rCnt <= valueRange.Rows.Count; rCnt++)
{
cell = (string)(valueRange.Cells[rCnt, 1] as Excel.Range).Value2;
if (cell == null || cell != email)
{
deleteRange=xlWorkSheet.get_Range(column + rCnt.ToString() + ":" + column + rCnt.ToString(), Type.Missing);
deleteRange.Delete(Excel.XlDeleteShiftDirection.xlShiftUp);
}
}
xlWorkBook.SaveAs(xlWorkBook.Path + @"\" + email, Excel.XlFileFormat.xlWorkbookDefault, Type.Missing, Type.Missing,
false, false, Excel.XlSaveAsAccessMode.xlNoChange,
Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing);
}
}
catch (Exception e)
{
MessageBox.Show(e.ToString());
}
finally
{
//DisposeMe();
// Release all COM RCWs.
// The "releaseObject" will just "do nothing" if null is passed,
// so no need to check to find out which need to be released.
// The "finally" is run in all cases, even if there was an exception
// in the "try".
// Note: passing "by ref" so afterwords "xlWorkSheet" will
// evaluate to null. See "releaseObject".
releaseObject( xlWorkSheet);
releaseObject( xlWorkBook);
// The Quit is done in the finally because we always
// want to quit. It is no different than releasing RCWs.
if (xlApp != null)
{
xlApp.Quit();
}
releaseObject( xlApp);
}
}
private string[] DistinctValues(Excel.Range EmailList)
{
string cell = "";
List<string> emails = new List<string>();
for (int rCnt = 1; rCnt <= EmailList.Rows.Count; rCnt++)
{
cell = (string)(EmailList.Cells[ rCnt,1] as Excel.Range).Value2;
if (cell!=null)
emails.Add(cell.ToString());
}
releaseObject(EmailList);
return emails.Distinct().ToArray();
}
private void releaseObject( object obj) // note ref!
{
// Do not catch an exception from this.
// You may want to remove these guards depending on
// what you think the semantics should be.
if (obj != null && Marshal.IsComObject(obj))
{
Marshal.ReleaseComObject(obj);
}
// Since passed "by ref" this assingment will be useful
// (It was not useful in the original, and neither was the
// GC.Collect.)
obj = null;
}
private void DisposeMe()
{
// Cleanup:
GC.Collect();
GC.WaitForPendingFinalizers();
Marshal.FinalReleaseComObject(xlWorkSheet);
xlWorkBook.Close(false, Type.Missing, Type.Missing);
Marshal.FinalReleaseComObject(xlWorkBook);
xlApp.Quit();
Marshal.FinalReleaseComObject(xlApp);
}
}
}
这是我如何实例化类!!
private void button1_Click(object sender, EventArgs e)
{
OpenFileDialog openFileDialog1 = new OpenFileDialog();
DialogResult result = openFileDialog1.ShowDialog(); // Show the dialog.
if (result == DialogResult.OK) // Test result.
InitializeWorkBook(openFileDialog1.FileName);
}
private void InitializeWorkBook(string filename)
{
WorkBook wb= new WorkBook(filename);
wb.CreateFiles("A");
}