Rowspan不使用顶行(Rowspan not using top row)

 我已经测试了你的代码，实际上它们确实重叠了。 （每次迭代时，背景颜色中的红色增加y_value / 2）。 
 
 
 将PictureBox的高度设置为（fe）20，你会发现它们显示得很好： 
 
Label[] l = new Label[15];
PictureBox[] pic1 = new PictureBox[15];
int y_value = 47;

for (int i = 0; i < 6; ++i)
{

    l[i] = new Label
    {
        Text = "Test Text",
        Font = new System.Drawing.Font("Calibri", 8, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte) (128))),
        ForeColor = System.Drawing.Color.White,
        BackColor = System.Drawing.Color.FromArgb(1, 0, 64),
        Size = new System.Drawing.Size(145, 20),
        Location = new Point(30, y_value),
        Anchor = AnchorStyles.Left,
        Visible = true
    };

    pic1[i] = new PictureBox
    {
        Size = new System.Drawing.Size(400, 20),
        Location = new Point(2, y_value - 10),
        Anchor = AnchorStyles.Left,
        Visible = true,
        BackColor = Color.FromArgb(y_value/2, 0, 0)
    };

    y_value += 37;
}

this.Controls.AddRange(l);
this.Controls.AddRange(pic1);
 

I've tested your code and in fact they do overlap. (increased red in backgroundcolor by y_value / 2 every iteration).
 
 
set height of your PictureBox to (f.e.) 20 and you will see that they show up just fine:
 
Label[] l = new Label[15];
PictureBox[] pic1 = new PictureBox[15];
int y_value = 47;

for (int i = 0; i < 6; ++i)
{

    l[i] = new Label
    {
        Text = "Test Text",
        Font = new System.Drawing.Font("Calibri", 8, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte) (128))),
        ForeColor = System.Drawing.Color.White,
        BackColor = System.Drawing.Color.FromArgb(1, 0, 64),
        Size = new System.Drawing.Size(145, 20),
        Location = new Point(30, y_value),
        Anchor = AnchorStyles.Left,
        Visible = true
    };

    pic1[i] = new PictureBox
    {
        Size = new System.Drawing.Size(400, 20),
        Location = new Point(2, y_value - 10),
        Anchor = AnchorStyles.Left,
        Visible = true,
        BackColor = Color.FromArgb(y_value/2, 0, 0)
    };

    y_value += 37;
}

this.Controls.AddRange(l);
this.Controls.AddRange(pic1);