C＃线程和ShowDialog问题

问题描述

| ProgressForm类：

public partial class ProgressForm : Form
    {
        public int prc = 0,sz;
        MainForm mf;

        public ProgressForm(MainForm MF)
        {
            InitializeComponent();
            mf = MF;
            sz = 0;
        }

        public ProgressForm(int mx)
        {
            InitializeComponent();
            sz = mx;
        }

        public void SetMax(int mx)
        {
            sz = mx;
        }

        public void StartProgress()
        {
            timer1.Enabled = true;
        }

        public void IncProgress(int prg)
        {
            prc += prg;
        }

        private void timer1_Tick(object sender,EventArgs e)
        {
            double pos = (double)prc / (double)sz * 100;
            progressBar.Value = (int)pos;
        }

        private void ProgressForm_FormClosing(object sender,FormClosingEventArgs e)
        {
            timer1.Enabled = false;
        }

        private void cancelBtn_Click(object sender,EventArgs e)
        {
            mf.isCanceled = true;
            this.Close();
        }

        private void ProgressForm_Shown(object sender,EventArgs e)
        {
            progressBar.Value = 0;
            StartProgress();
        }

    }

MainForm类：

void DeleteFiles()
            {
                int x = 0;
                int cnt = resultList.Count;
                isCanceled = false;

                DeleteThreadHandler(\"beginprogress\");
                try
                {
                    DeleteThreadHandler(\"begindelete\");
                    for (int j = 0; j < cnt; j++)
                    {
                        if (resultList[x].isChecked)
                        {
                            DeleteThreadHandler(\"progress\");
                            DeleteFile(resultList[x].name,deleteForm.isDeletePermanently);
                            if (File.Exists(resultList[x].name))
                            {
                                DeleteErrorHandler(resultList[x].name);
                                isError = true;
                            }
                            else
                                resultList.RemoveAt(x);
                        }
                        else
                            ++x;

                        if (isCanceled)
                            break;
                    }
                }
                finally
                {
                    validity(true);
                    DeleteThreadHandler(\"enddelete\");
                }
            }

            void DeleteErrorHandler(string val)
            {
                Action action = null;

                action = () =>
                {
                    errorReportForm.AddError(val);
                };

                this.BeginInvoke(action);
            }

            void DeleteThreadHandler(String title)
            {
                Action action = null;
                if (title == \"beginprogress\")
                {
                    action = () =>
                    {

                    };
                }
                else
                if (title == \"begindelete\")
                {
                    action = () =>
                    {
                        olvVirtual.BeginUpdate();
                    };
                }
                else
                    if (title == \"enddelete\")
                    {
                        action = () =>
                        {
                            olvVirtual.VirtualListSize = resultList.Count;
                            olvVirtual.EndUpdate();
                            RefreshStatus();
                            progressForm.Close();
                            if (isError)
                                errorReportForm.ShowDialog();
                        };
                    }
                if (title == \"progress\")
                {
                    action = () =>
                    {
                        progressForm.IncProgress(1);
                    };
                }

                this.BeginInvoke(action);
            }    


    private void DeleteBtn_Click(object sender,EventArgs e)
        {
            int checkedcount = GetCheckedCount();
            if (checkedcount == 0)
            {
                MessageBox.Show(\"Please mark at least a file first\");
                return;
            }
            DialogResult dr = new DialogResult();
            if (deleteForm == null)
                deleteForm = new DeleteForm();
            dr = deleteForm.ShowDialog();
            if (dr == DialogResult.OK)
            {
                //if (progressForm == null)
                progressForm = new ProgressForm(this);
                progressForm.Text = \"Deleting...\";
                progressForm.SetMax(checkedcount);

                if (errorReportForm == null)
                    errorReportForm = new ErrorReportForm();
                errorReportForm.ClearMemo();
                isError = false;

                Thread t = new Thread(DeleteFiles);
                t.Start();
                progressForm.ShowDialog();
            }
        }

在progressForm中，有一个进度条和计时器，每500毫秒更新一次进度。 问题是我仍然可以访问主窗体，我也尝试了BeginInvoke，但是都没有用 有人知道怎么了吗？ 谢谢 编辑：我发现了这个混乱的源头，它是使用Microsoft.VisualBasic.FileIO.FileSystem.DeleteFile的DeleteFile。用非托管代码替换后，它可以正常工作。     

解决方法

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