我有我自己的类扩展PictureBox。当我围绕它画一个圆时,我遇到了一个问题。问题出在“base.OnPaint(e)”上,它抛出一个ArgumentException。我把代码放在下面,然后是完整的类。base.OnPaint(e)ArgumentException
抛出异常的方法:
private void Parent_Paint(object sender, PaintEventArgs e)
{
if (clickPerformed)
{
using (Graphics g = e.Graphics)
{
using (Pen pen = new Pen(Color.Black, 2))
{
float locationX = this.Location.X + this.Size.Width/2;
float locationY = this.Location.Y + this.Size.Height/2;
float radius = (this.Size.Height + this.Size.Width)/2;
float[] dashValues = { 5, 2, 15, 4 };
pen.DashPattern = dashValues;
DrawCircle(g, pen, locationX, locationY, radius); // draw circle
clickPerformed = false; // process done so set it to false
}
}
}
base.OnPaint(e);
}
的Unidad.cs类:
public class Unidad : PictureBox
{
//Constructor
public Unidad(string nombre, string tipo, int movimiento, int ha, int hp, int fuerza, int resistencia, int heridas, int iniciativa, int ataques, int liderazgo, int coste, string rutaImagen)
{
tipoUnidad = tipo;
movimientoUnidad = movimiento;
nombreUnidad = nombre;
costeUnidad = coste;
haUnidad = ha;
hpUnidad = hp;
fuerzaUnidad = fuerza;
resistenciaUnidad = resistencia;
iniciativaUnidad = iniciativa;
ataquesUnidad = ataques;
liderazgoUnidad = liderazgo;
rutaImagenUnidad = rutaImagen;
}
//Propiedades
public string nombreUnidad { get; set; }
public string tipoUnidad { get; set; }
public int movimientoUnidad { get; set; }
public int costeUnidad { get; set; }
public int haUnidad { get; set; }
public int hpUnidad { get; set; }
public int fuerzaUnidad { get; set; }
public int resistenciaUnidad { get; set; }
public int heridasUnidad { get; set; }
public int iniciativaUnidad { get; set; }
public int ataquesUnidad { get; set; }
public int liderazgoUnidad { get; set; }
public string rutaImagenUnidad { get; set; }
//Método para dibujar unidad
public void Colocar(Control control, Unidad unidad, Point p)
{
unidad.Location = p;
control.Controls.Add(unidad);
}
protected override void OnPaint(PaintEventArgs pe)
{
if (this.Parent != null)
{
this.Parent.Paint += Parent_Paint; // picturebox's paint means it added to parent so we need to trigger parent's paint event
}
base.OnPaint(pe);
}
bool clickPerformed = false; // to catch control has mouse down
private Point MouseDownLocation;
protected override void OnMouseDown(MouseEventArgs e)
{
base.OnMouseDown(e);
clickPerformed = true; // set mouse down
Control tempSender = this.Parent; // get sender
tempSender.Invalidate(); // invalidate to trigger paint event
MouseDownLocation = e.Location;
}
private void Parent_Paint(object sender, PaintEventArgs e)
{
if (clickPerformed)
{
using (Graphics g = e.Graphics)
{
using (Pen pen = new Pen(Color.Black, 2))
{
float locationX = this.Location.X + this.Size.Width/2;
float locationY = this.Location.Y + this.Size.Height/2;
float radius = (this.Size.Height + this.Size.Width)/2;
float[] dashValues = { 5, 2, 15, 4 };
pen.DashPattern = dashValues;
DrawCircle(g, pen, locationX, locationY, radius); // draw circle
clickPerformed = false; // process done so set it to false
}
}
}
base.OnPaint(e);
}
protected override void OnMouseUp(MouseEventArgs e)
{
this.Parent.Invalidate(); // mouse up circle should be erased, so invalidate again to trigger paint, but this time clickPerformed is false
// so it won't draw circle again
base.OnMouseDown(e);
}
public void DrawCircle(Graphics g, Pen pen, float centerX, float centerY, float radius)
{
g.DrawEllipse(pen, centerX - radius, centerY - radius, radius + radius, radius + radius);
}
protected override void OnMouseMove(MouseEventArgs e)
{
base.OnMouseMove(e);
if (clickPerformed)
{
Left = e.X + Left - MouseDownLocation.X;
Top = e.Y + Top - MouseDownLocation.Y;
}
}
//Método para dibujar la zona límite de movimiento de la unidad
public void DibujarLimites()
{
using (Graphics g = CreateGraphics())
{
using (Pen pen = new Pen(Color.Red, 2))
{
float[] dashValues = { 5, 2, 15, 4 };
pen.DashPattern = dashValues;
DrawCircle(g, pen, 0, 0, 20);
}
}
}
}
当我删除了 “base.OnPaint(E)” 行,它给了我一个“ Program.cs中System.ArgumentException'在System.Drawing.dll中',在线:“Application.Run(new Form1());”
任何人都可以帮助我吗?谢谢!
为什么你调用'base.OnPaint()'_after_你画自己?这会再次覆盖您的图纸。我猜这个异常是因为你在调用'base.OnPaint()''之前'在事件参数中'Dispose'' Graphics'实例。除去配置'Grahics'实例的'using'语句。 –
'base.OnPaint()'通常用于'override OnPaint'。 –
'使用(Graphics g = e.Graphics)'你没有创建它,所以你不应该处理它! – TaW