winform在悬停时更改按钮的BackgroundImage属性

Question

我想更改悬停按钮的backgroundImage 属性，如下所示：

    private void btnGetHardwareID_MouseEnter(object sender, EventArgs e)
    {
        btnGetHardwareID.BackgroundImage = (System.Drawing.Image)(Properties.Resources._11949847771696668271pill_button_green_benji__01_svg_med);
        btnGetHardwareID.Refresh();
    }

    private void btnGetHardwareID_MouseLeave(object sender, EventArgs e)
    {
        btnGetHardwareID.BackgroundImage = (System.Drawing.Image)(Properties.Resources._11949847771793996117pill_button_purple_benji_01_svg_med);
        btnGetHardwareID.Refresh();
    }

btnGetHardwareID 的属性如下：

    // btnGetHardwareID
    // 
    this.btnGetHardwareID.BackColor = System.Drawing.Color.Transparent;
    this.btnGetHardwareID.BackgroundImage = global::Travian.Properties.Resources._11949847771793996117pill_button_purple_benji_01_svg_med;
    this.btnGetHardwareID.BackgroundImageLayout = System.Windows.Forms.ImageLayout.Stretch;
    this.btnGetHardwareID.FlatAppearance.BorderSize = 0;
    this.btnGetHardwareID.FlatStyle = System.Windows.Forms.FlatStyle.Flat;
    this.btnGetHardwareID.Font = new System.Drawing.Font("Cambria", 10F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
    this.btnGetHardwareID.ForeColor = System.Drawing.Color.White;
    this.btnGetHardwareID.Location = new System.Drawing.Point(31, 53);
    this.btnGetHardwareID.Name = "btnGetHardwareID";
    this.btnGetHardwareID.Size = new System.Drawing.Size(160, 40);
    this.btnGetHardwareID.TabIndex = 25;
    this.btnGetHardwareID.Text = "Get My Hardware-ID";
    this.btnGetHardwareID.UseVisualStyleBackColor = false;
    this.btnGetHardwareID.Click += new System.EventHandler(this.btnGetHardwareID_Click);
    this.btnGetHardwareID.MouseDown += new System.Windows.Forms.MouseEventHandler(this.btnGetHardwareID_MouseDown);
    this.btnGetHardwareID.MouseEnter += new System.EventHandler(this.btnGetHardwareID_MouseEnter);
    this.btnGetHardwareID.MouseLeave += new System.EventHandler(this.btnGetHardwareID_MouseLeave);
    this.btnGetHardwareID.MouseUp += new System.Windows.Forms.MouseEventHandler(this.btnGetHardwareID_MouseUp);

现在的问题是 MouseEnter 上的 backgroundImage 是这样的：

在 MouseLeave 上是这样的：

绿色按钮周围的灰色背景色是什么，我该如何移除它？

编辑
原图如下：

还有那个MainForm的背景：

提前致谢

Answer 1

您正在寻找的解决方案如下。将 FlatAppearance.MouseOverBackColor 设置为透明。

this.btnGetHardwareID.FlatAppearance.MouseOverBackColor = System.Drawing.Color.Transparent;