添加命名空间：
using System.Runtime.InteropServices;

在类里面添加：
//2018-1-19 文件操作 判断文件是否被占用[DllImport("kernel32.dll")]public static extern IntPtr _lopen(string lpPathName, int iReadWrite);[DllImport("kernel32.dll")]public static extern bool CloseHandle(IntPtr hObject);public const int OF_READWRITE = 2;public const int OF_SHARE_DENY_NONE = 0x40;public readonly IntPtr HFILE_ERROR = new IntPtr(-1);

private void btnDelete_Click(object sender, RoutedEventArgs e){int[] _intRow = this.tableView1.GetSelectedRowHandles();if (_intRow == null || _intRow.Length <= 0 || _intRow[0] < 0){MessageBox.Show("请选择你需要删除的数据!", "提示", MessageBoxButton.OK, MessageBoxImage.Information);}else{if (MessageBox.Show(this, "是否删除所选的图片?", "提示", MessageBoxButton.YesNo, MessageBoxImage.Question) == System.Windows.MessageBoxResult.Yes){for (int i = 0; i < _intRow.Length; i++){object str = gridImgData.GetCellValue(_intRow[i], "VarPath");                        //判断文件是否占用IntPtr vHandle = _lopen(str.ToString(), OF_READWRITE | OF_SHARE_DENY_NONE);if (vHandle == HFILE_ERROR)//被占用{if (MessageBox.Show("该图片在工程中已使用，是否确定移动或删除的操作？", "提示", MessageBoxButton.YesNo, MessageBoxImage.Question) == System.Windows.MessageBoxResult.Yes){try{if (File.Exists(str.ToString()))//如果存在文件
                                    {File.Delete(str.ToString());}tableView1.DeleteRow(_intRow[i]);//删除列表上的记录
                                }catch (Exception ex){string strmsg = string.Format("图片删除失败，原因：{0}", ex.Message);MessageBox.Show(strmsg, "提示", MessageBoxButton.OK, MessageBoxImage.Information);}}else//未被占用{return;}}else{try{if (File.Exists(str.ToString()))//如果存在文件
                                {File.Delete(str.ToString());}tableView1.DeleteRow(_intRow[i]);//删除列表上的记录
                            }catch (Exception ex){string strmsg = string.Format("图片删除失败，原因：{0}", ex.Message);MessageBox.Show(strmsg, "提示", MessageBoxButton.OK, MessageBoxImage.Information);}}}}}}