C# 用7Z 压缩 ZIP

string _appPath = new DirectoryInfo(Assembly.GetExecutingAssembly().ManifestModule.FullyQualifiedName).Parent.FullName;
                if (!_appPath.EndsWith(@"\"))
                {
                    _appPath += @"\";
                }
                string s7z = _appPath + "7z.exe";
                if (File.Exists(s7z))
                {
                    System.Diagnostics.Process pNew = new System.Diagnostics.Process();
                    pNew.StartInfo.FileName = s7z;
                    pNew.StartInfo.Arguments = string.Format(" a -tzip {0} {1}", zipFileFullName, backupFileFullName);
                    pNew.Start();
                    //一定要等待完成后，才能删除。
                    pNew.WaitForExit();
                    //压完后删除原有的
                    File.Delete(backupFileFullName);
                }
                else
                {
                    sMsg = "找不到7z.exe。";
                    return false;
                }

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