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我遇到了Windows窗體應用程序的問題。我不得不改變配置來處理訪問衝突異常。使用線性漸變畫筆將窗體邊框樣式更改爲無，導致錯誤
無論如何，我基本上做了一個程序，彈出在右下角像通知。這不是整個計劃，但我會整合。我在LinearGradientBrush類中遇到了一些問題。我注意到我的窗口在試圖通過AccessViolationExcetption繪製背景時移動，所以我在OnPaintBackgroundMethod中創建了一個布爾值來記錄繪圖過程何時發生，並確保窗口在函數運行時不會移動。這似乎解決了這個問題。除了當我進一步通過在FormBorderStyle面板中刪除邊框來定製表單設計時，問題返回。我不知道爲什麼這會導致任何麻煩，並且無處不在尋找解決方案無濟於事。任何幫助深表感謝。謝謝
<configuration>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
</startup>
<runtime>
<legacyCorruptedStateExceptionsPolicy enabled="true" />
</runtime>
</configuration>
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace NewToasterNotifier
{
public partial class Form1 : Form
{
private Timer timer;
private int startPosX, startPosY, beginning, middle, speed, paintCount;
private bool rectangleIsDrawing;
public Form1()
{
InitializeComponent();
TopMost = true;
ShowInTaskbar = false;
timer = new Timer();
timer.Interval = 20;
timer.Tick += timer_Tick;
//This divides the window into three sections
//The beginning is first used as the scalar amaount of each interval
beginning = Height/3;
//middle is where the middle section ends
middle = Screen.PrimaryScreen.WorkingArea.Height - 2 * beginning;
//and now beginnning is where the beginning section ends
//the true begginnning section starts at the screen.height
beginning = Screen.PrimaryScreen.WorkingArea.Height - beginning;
speed = 0;
}
//On load of the form
protected override void OnLoad(EventArgs e)
{
startPosX = Screen.PrimaryScreen.WorkingArea.Width - Width;
startPosY = Screen.PrimaryScreen.WorkingArea.Height;
SetDesktopLocation(startPosX, startPosY);
base.OnLoad(e);
timer.Start();
paintCount = 0;
}
//Override of the onPaintbackground, which allows us to make a different background on windows forms
protected override void OnPaintBackground(PaintEventArgs e)
{
rectangleIsDrawing = true;
paintCount++;
Console.Write("\n Painting... " + paintCount.ToString());
//implements a linear gradient to the background
using (LinearGradientBrush brush = new LinearGradientBrush(this.ClientRectangle,
Color.Gray,
Color.Black,
90F))
{
paintThatShiz(e, brush);
}
}
//linear gradient needs to change on resize
protected override void OnResize(EventArgs e)
{
this.Invalidate();
base.OnResize(e);
}
//debugging purposes
private void paintThatShiz(PaintEventArgs e, LinearGradientBrush brush)
{
try { e.Graphics.FillRectangle(brush, this.ClientRectangle); }
catch (AccessViolationException x)
{
Console.Write("No, no, no!!!!!");
paintThatShiz(e, brush);
}
catch (InvalidOperationException z)
{
Console.Write("This is ridiculous, \n");
Console.Write(z.StackTrace);
paintThatShiz(e, brush);
}
rectangleIsDrawing = false;
}
//called every 10ms for window to animate and stops when done
void timer_Tick(object sender, EventArgs e)
{
if (rectangleIsDrawing) { return; }
Console.Write("\n Starting to move");
// this if block is for the swing animation
//in the beginning it speeds up
if (startPosY > beginning)
{
speed++;
}//in the end it slows down
else if (startPosY < middle)
{
if (speed > 1)
{
speed--;
}
}
//in the middle it stays constant
Console.Write(speed.ToString() + " ");
startPosY -= speed;
//Stops when done
if (startPosY < Screen.PrimaryScreen.WorkingArea.Height - Height)
{
timer.Stop();
} // checks again to see if rectangle is drawing before accessing window location data
else {
if (rectangleIsDrawing) {
startPosY += speed;
return;
}
SetDesktopLocation(startPosX, startPosY);
}
}
}
}