在C#中出现“System.Windows.Forms.Button”并不包含对“FlatAppearance”的定义，怎么办 5
我画了一个button按钮，然后想把它设置为透明的，写了一段代码privatevoidbutton1_MouseEnter(objectsender,System.Eve...
我画了一个button按钮，然后想把它设置为透明的，写了一段代码
private void button1_MouseEnter(object sender, System.EventArgs e)
{
button1.FlatStyle = FlatStyle.Flat;
button1.FlatAppearance.BorderSize = 0;
button1.FlatAppearance.MouseOverBackColor = Form1.ActiveForm.BackColor;
button1.FlatAppearance.MouseDownBackColor = Form1.ActiveForm.BackColor;
}
运行时就出现这个错误啦，请高手帮帮忙，谢谢！ 展开
private void button1_MouseEnter(object sender, System.EventArgs e)
{
button1.FlatStyle = FlatStyle.Flat;
button1.FlatAppearance.BorderSize = 0;
button1.FlatAppearance.MouseOverBackColor = Form1.ActiveForm.BackColor;
button1.FlatAppearance.MouseDownBackColor = Form1.ActiveForm.BackColor;
}
运行时就出现这个错误啦，请高手帮帮忙，谢谢！ 展开
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