下面的代码用于将数据从本地系统移动到外部硬盘驱动器。客户的要求是使用线程来加速页面/分钟的复制。
我面临一个问题。我在while循环下使用了continue语句，这在线程下是不可接受的。有人可以建议替代相同的。
感谢。
private void PromoteMain(TextWriter streamWriter)
{
string driveLetterString;
driveLetterString = GetExternalDrive();
if (!string.IsNullOrEmpty(driveLetterString))
{
DataSet dataSet;
DateTime startSnooze;
DataRow row;
string imageIdString;
string reelIdString;
string destImagePathString;
string[] strArrays;
int i;
string fileName;
string[] strArrays3;
string[] strArrays4;
bool flag;
string[] strArrays5;
bool flag1;
string[] strArrays6;
bool flag2;
string[] files;
TimeSpan timeSpan1;
IEnumerator iEnumerator1;
string[] stringArray1;
IDisposable iDisposable1;
dataSet = this.GetImagesFromDatabase();
if (((dataSet != null) && (dataSet.Tables.Count != 0)) && (dataSet.Tables[0].Rows.Count != 0))
{
iEnumerator1 = dataSet.Tables[0].Rows.GetEnumerator();
try
{
#region goto L_05A9
//goto L_05A9;
while (iEnumerator1.MoveNext())
{
driveLetterString = GetExternalDrive();
new Thread(() =>
{
if (!string.IsNullOrEmpty(driveLetterString))
{
row = ((DataRow)iEnumerator1.Current);
imageIdString = row["imageid"].ToString();
reelIdString = row["reelid"].ToString();
destImagePathString = row["destimagepath"].ToString();
if (!Directory.Exists(destImagePathString))
{
if (this.stringBuilderFail.Length > 0)
{
StringBuilder stringBuilder7 = this.stringBuilderFail.Append(",");
}
StringBuilder stringBuilder8 = this.stringBuilderFail.Append(imageIdString);
this._lblFailed.Text = Convert.ToString(((int)(Convert.ToInt32(this._lblFailed.Text) + 1)));
if (this.stringBuilderFail.Length > 7000)
{
this.UpdateImagesInDatabase(this.stringBuilderFail.ToString(), "5");
StringBuilder stringBuilder9 = this.stringBuilderFail.Remove(0, this.stringBuilderFail.Length);
}
this.RefreshFormView();
continue;
}
if (!Directory.Exists((driveLetterString + "newspaper\\" + reelIdString + "\\")))
{
DirectoryInfo directoryInfo1 = Directory.CreateDirectory((driveLetterString + "newspaper\\" + reelIdString + "\\"));
}
strArrays = new string[] { ".pdf", ".html", "_clean.html", "_lx.jpg" };
for (i = 0; (i < strArrays.Length); i++)
{
fileName = strArrays[i];
try
{
if (i != 2)
{
strArrays3 = new string[] { driveLetterString, "newspaper\\", reelIdString, "\\", imageIdString, fileName };
File.Copy((destImagePathString + imageIdString + fileName), string.Concat(strArrays3));
}
}
catch
{
}
}
strArrays4 = new string[] { driveLetterString, "newspaper\\", reelIdString, "\\", imageIdString, ".pdf" };
flag = File.Exists(string.Concat(strArrays4));
strArrays5 = new string[] { driveLetterString, "newspaper\\", reelIdString, "\\", imageIdString, "_lx.jpg" };
flag1 = File.Exists(string.Concat(strArrays5));
strArrays6 = new string[] { driveLetterString, "newspaper\\", reelIdString, "\\", imageIdString, ".html" };
flag2 = File.Exists(string.Concat(strArrays6));
if ((flag && flag1) && flag2)
{
streamWriter.WriteLine(imageIdString);
if (this.stringBuilderSuccess.Length > 0)
{
StringBuilder stringBuilder3 = this.stringBuilderSuccess.Append(",");
}
StringBuilder stringBuilder4 = this.stringBuilderSuccess.Append(imageIdString);
this._lblPromoted.Text = Convert.ToString(((int)(Convert.ToInt32(this._lblPromoted.Text) + 1)));
#region goto L_0453
L_0453();
continue;
#endregion
}
files = Directory.GetFiles((driveLetterString + "newspaper\\" + reelIdString + "\\"), (imageIdString + "*.*"));
stringArray1 = files;
foreach (string str6 in stringArray1)
{
try
{
File.Delete(str6);
}
catch
{
}
}
if (this.stringBuilderFail.Length > 0)
{
StringBuilder stringBuilder1 = this.stringBuilderFail.Append(",");
}
StringBuilder stringBuilder2 = this.stringBuilderFail.Append(imageIdString);
this._lblFailed.Text = Convert.ToString(((int)(Convert.ToInt32(this._lblFailed.Text) + 1)));
#region goto L_0453
L_0453();
continue;
#endregion
}
else
{
break;
};
}).Start();
}
#endregion
}
finally
{
iDisposable1 = (iEnumerator1 as IDisposable);
if (iDisposable1 != null)
{
iDisposable1.Dispose();
}
}
if (this.stringBuilderSuccess.Length > 0)
{
this.UpdateImagesInDatabase(this.stringBuilderSuccess.ToString(), "3");
StringBuilder stringBuilder10 = this.stringBuilderSuccess.Remove(0, this.stringBuilderSuccess.Length);
}
if (this.stringBuilderFail.Length > 0)
{
this.UpdateImagesInDatabase(this.stringBuilderFail.ToString(), "5");
StringBuilder stringBuilder11 = this.stringBuilderFail.Remove(0, this.stringBuilderFail.Length);
}
this.RefreshFormView();
#region goto L_0671
PromoteMain(streamWriter);
#endregion
}
else
{
startSnooze = DateTime.Now;
timeSpan1 = DateTime.Now.Subtract(startSnooze);
while (timeSpan1.TotalSeconds < 300D)
{
timeSpan1 = DateTime.Now.Subtract(startSnooze);
Thread.Sleep(125);
Application.DoEvents();
}
PromoteMain(streamWriter);
}
}
//else
//{
// MessageBox.Show("There is no space in selected drives");
// //there is no space in any external drive
//}
}
private void L_0453()
{
if (this.stringBuilderSuccess.Length > 7000)
{
this.UpdateImagesInDatabase(this.stringBuilderSuccess.ToString(), "3");
StringBuilder stringBuilder5 = this.stringBuilderSuccess.Remove(0, this.stringBuilderSuccess.Length);
}
if (this.stringBuilderFail.Length > 7000)
{
this.UpdateImagesInDatabase(this.stringBuilderFail.ToString(), "5");
StringBuilder stringBuilder6 = this.stringBuilderFail.Remove(0, this.stringBuilderFail.Length);
}
this.RefreshFormView();
}
答案 0 :(得分：0)
用return返回continue语句。这将完成线程的执行。现在我不知道这个继续声明是如何结束的，但是由于操作并行运行，你实际上无法继续。你也应该提取这一行
row = ((DataRow)iEnumerator1.Current);
或者您冒险让枚举器在执行之前从另一个线程更改。您可能还想尝试使用Parallel.Foreach来减少可能的错误并获得更有效的执行。更好的方法是使用异步IO与异步IO（而不是使用线程的方法），并使用Task.WaitAll等待它们完成。