分享一个线程安全的加载窗体

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Windows.Forms;

namespace Eits.Util
{
    public class LoadingPanelHelper
    {
        private static Thread thd = null;
        private static FormLoadingPanel proc = null;
        private static readonly object syncRoot = new object();

        public static void Show(string status = "正在加载应用数据......")
        {
            if (proc == null)
            {
                Monitor.Enter(syncRoot);
                if (proc == null)
                {
                    FormLoadingPanel temp = new FormLoadingPanel();
                    Interlocked.Exchange(ref proc, temp);
                }
                Monitor.Exit(syncRoot);
            }
            if ((thd == null || (thd != null && !thd.IsAlive)))
            {
                Monitor.Enter(syncRoot);
                if ((thd == null || (thd != null && !thd.IsAlive)))
                {
                    Thread temp = new Thread(() => Application.Run(proc));
                    temp.IsBackground = true;
                    temp.SetApartmentState(ApartmentState.STA);
                    temp.Start();
                    Interlocked.Exchange(ref thd, temp);
                }
                Monitor.Exit(syncRoot);
            }
            Monitor.Enter(syncRoot);
            proc.SetStatusInfo(status);
            Monitor.Exit(syncRoot);
        }

        public static void Close()
        {
            if (thd != null && thd.IsAlive && proc != null && !proc.IsDisposed)
            {
                Monitor.Enter(syncRoot);
                if (thd != null && thd.IsAlive && proc != null && !proc.IsDisposed)
                {
                    proc.CloseForm();
                }
                Monitor.Exit(syncRoot);
            }
        }
    }
}

LoadingPanelHelper类是用来展示状态或者关闭状态的,下面是Loading的展示Form,使用了Infragistics的一个控件,大家可以自行删除,仅仅起了个美观的作用.

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;

namespace Eits.Util
{
    public partial class FormLoadingPanel : Form
    {
        public FormLoadingPanel()
        {
            InitializeComponent();
            Control.CheckForIllegalCrossThreadCalls = false;
        }

        public void SetStatusInfo(string status)
        {
            if (this.InvokeRequired)
            {
                this.Invoke(new Action<string>(SetStatusInfo), status);
            }
            else
            {
                this.lblStatus.Text = status;
            }
　　　　　　　if (this.IsHandleCreated && !this.Visible)
　　　　　　　{
　　　　　　　　　this.Invoke(new Action(this.Show));
　　　　　　　}

        }

        public void CloseForm()
        {
            if (this.InvokeRequired)
            {
                this.Invoke(new Action(CloseForm));
            }
            else
            {
                if (this.IsHandleCreated && !this.IsDisposed)
                {
                    this.Invoke(new Action(this.Hide));
                }
            }
        }
    }
}

Designer部分

namespace Eits.Util
{
    partial class FormLoadingPanel
    {
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Windows Form Designer generated code

        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.ultraActivityIndicatorProgressStatus = new Infragistics.Win.UltraActivityIndicator.UltraActivityIndicator();
            this.lblStatus = new Infragistics.Win.Misc.UltraLabel();
            this.pnl = new Infragistics.Win.Misc.UltraPanel();
            this.pnl.ClientArea.SuspendLayout();
            this.pnl.SuspendLayout();
            this.SuspendLayout();
            // 
            // ultraActivityIndicatorProgressStatus
            // 
            this.ultraActivityIndicatorProgressStatus.AnimationEnabled = true;
            this.ultraActivityIndicatorProgressStatus.AnimationSpeed = 35;
            this.ultraActivityIndicatorProgressStatus.CausesValidation = true;
            this.ultraActivityIndicatorProgressStatus.Dock = System.Windows.Forms.DockStyle.Bottom;
            this.ultraActivityIndicatorProgressStatus.Location = new System.Drawing.Point(0, 23);
            this.ultraActivityIndicatorProgressStatus.Name = "ultraActivityIndicatorProgressStatus";
            this.ultraActivityIndicatorProgressStatus.Size = new System.Drawing.Size(410, 23);
            this.ultraActivityIndicatorProgressStatus.TabIndex = 0;
            this.ultraActivityIndicatorProgressStatus.TabStop = true;
            // 
            // lblStatus
            // 
            this.lblStatus.Dock = System.Windows.Forms.DockStyle.Fill;
            this.lblStatus.Location = new System.Drawing.Point(0, 0);
            this.lblStatus.Name = "lblStatus";
            this.lblStatus.Size = new System.Drawing.Size(410, 23);
            this.lblStatus.TabIndex = 1;
            this.lblStatus.Text = "正在加载应用数据......";
            // 
            // pnl
            // 
            this.pnl.BorderStyle = Infragistics.Win.UIElementBorderStyle.Etched;
            // 
            // pnl.ClientArea
            // 
            this.pnl.ClientArea.Controls.Add(this.lblStatus);
            this.pnl.ClientArea.Controls.Add(this.ultraActivityIndicatorProgressStatus);
            this.pnl.Dock = System.Windows.Forms.DockStyle.Fill;
            this.pnl.Location = new System.Drawing.Point(3, 3);
            this.pnl.Name = "pnl";
            this.pnl.Size = new System.Drawing.Size(414, 50);
            this.pnl.TabIndex = 2;
            // 
            // FormProgressStatus
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(420, 56);
            this.Controls.Add(this.pnl);
            this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
            this.Name = "FormProgressStatus";
            this.Padding = new System.Windows.Forms.Padding(3);
            this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
            this.Text = " ";
            this.TopMost = true;
            this.pnl.ClientArea.ResumeLayout(false);
            this.pnl.ResumeLayout(false);
            this.ResumeLayout(false);

        }

        #endregion

        private Infragistics.Win.UltraActivityIndicator.UltraActivityIndicator ultraActivityIndicatorProgressStatus;
        private Infragistics.Win.Misc.UltraLabel lblStatus;
        private Infragistics.Win.Misc.UltraPanel pnl;
    }
}

经过本人多次测试,应该是没有问题的,多个线程同时访问也OK,测试机器是 win7 + .net 4.0 ,如有任何问题,欢迎大家跟帖指正,Thanks.

//2013-08-08 修改了界面假死和禁止从其他线程访问的问题