13518219792
设置Region属性：DimpathAsNewSystem.Drawing.Drawing2D.GraphicsPathpath.AddEllipse(0,0,400,300)Region=NewRegion(path)
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写的比较粗糙，参考一下吧
Sub Main()
Dim numArr() As Double
Dim count As Integer = 1
Dim num As Double
Dim sumNum As Double = 0
Dim aveNum As Double
Dim flag As Integer = 0
While (True)
Console.Write("请输入第{0}个数:", count）
ReDim Preserve numArr(count - 1)
num = Convert.ToDouble(Console.ReadLine())
If num = 0 Then
Exit While
End If
numArr(count - 1) = num
count += 1
End While
If count 1 Then
Dim cha As Double
Dim minCha As Double = Double.MaxValue
For i As Integer = 0 To count - 1
sumNum += numArr(i)
Next
aveNum = sumNum / (count - 1)
For i As Integer = 0 To count - 1
cha = Math.Abs(aveNum - numArr(i))
If minCha = cha Then
minCha = cha
flag = i + 1
End If
Next
End If
Console.WriteLine("总共输入{0}个正数，平均值为{1}", count - 1, aveNum）
Console.WriteLine("最接近平均值的是第{0}个正数，值为{1}", flag, numArr(flag - 1)）
Console.ReadKey()
End Sub
新建窗体，把maximizebox属性和MinimizeBox 属性设为false，再添加一个Label1放置文字一个Picturebox1放图片。
在窗体的load事件中：
Private Sub Form1_Load() Handles Me.Load
Text="我的VB.NET程序"
PuctureBox1.Image=Image.FromFile(图片路径如e:\pic.jpg)
End Sub
窗体Click事件：
Private Sub Form1_Click() Handles Me.Click
Text="单击窗体"
Label1.Text="欢迎使用VB.NET"
End Sub
窗体DoubleClick事件
Private Sub Form1_DoubleClick() Handles Me.DoubleClick
Text="双击窗体"
Label1.Text = "谢谢使用！"
End Sub
