Question

关于mousedown、mouseup、mousemove、C#

private void toolStripButton3_Click_1(object sender, EventArgs e)
{

this.pbImg.MouseDown += new MouseEventHandler(toolStripButton3_MouseDown);

this.pbImg.MouseUp += new MouseEventHandler(toolStripButton3_MouseUp);

this.pbImg.MouseMove += new MouseEventHandler(toolStripButton3_MouseMove);
private void FillCircle_Click(object sender, EventArgs e)
{

this.pbImg.MouseDown += new MouseEventHandler(FillCircle_MouseDown);

this.pbImg.MouseUp += new MouseEventHandler(FillCircle_MouseUp);

this.pbImg.MouseMove += new MouseEventHandler(FillCircle_MouseMove);
}

}

如何不让mouseup、mousedown、mousemove反复执行，画直线的时候就画直线，画矩形的时候就画矩形

错误的事例如下图矩形和直线同时画

Answer 1

在add之前先remove掉就行了：
private void toolStripButton3_Click_1(object sender, EventArgs e)
{
this.pbImg.MouseDown -= new MouseEventHandler(FillCircle_MouseDown);

this.pbImg.MouseUp -= new MouseEventHandler(FillCircle_MouseUp);

this.pbImg.MouseMove -= new MouseEventHandler(FillCircle_MouseMove);
this.pbImg.MouseDown += new MouseEventHandler(toolStripButton3_MouseDown);

this.pbImg.MouseUp += new MouseEventHandler(toolStripButton3_MouseUp);

this.pbImg.MouseMove += new MouseEventHandler(toolStripButton3_MouseMove);
}
private void FillCircle_Click(object sender, EventArgs e)
{
this.pbImg.MouseDown -= new MouseEventHandler(toolStripButton3_MouseDown);

this.pbImg.MouseUp -= new MouseEventHandler(toolStripButton3_MouseUp);

this.pbImg.MouseMove -= new MouseEventHandler(toolStripButton3_MouseMove);
this.pbImg.MouseDown += new MouseEventHandler(FillCircle_MouseDown);

this.pbImg.MouseUp += new MouseEventHandler(FillCircle_MouseUp);

this.pbImg.MouseMove += new MouseEventHandler(FillCircle_MouseMove);
}

}

Answer 2

不懂