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winforms根据标签更改按钮名称

powershell

Wakan Tanka · 技术社区 · 5 年前

我的目标是根据显示的文本更改按钮文本 Label

Add-Type -AssemblyName System.Windows.Forms

class MyForm : System.Windows.Forms.Form {
    MyForm($mystuff) {
        #Do-Stuff
        $this.Add_Load( $this.MyForm_Load )
    }

    $MyForm_Load = {

        $mlabel = [System.Windows.Forms.Label]::new()
        $mlabel.Name = "status"
        $mlabel.Text = "enabled"


        $mbutton = [System.Windows.Forms.Button]::new()
        if ($this.parent.controls["status"].text -eq "enabled"){
            $mbutton.text = "disable"
        }else{
            $mbutton.text = "enable"
        }

        $mbutton.Location = [System.Drawing.Point]::new(100,100)
        $mbutton.Add_Click( $this.mbutton_click )

        $this.Controls.Add($mlabel)
        $this.Controls.Add($mbutton)
    }

    $mbutton_click = {
        if ($this.Parent.Controls["status"].Text -eq "enabled"){
            $this.Parent.Controls["status"].Text = "disabled"
        }
        else{
            $this.Parent.Controls["status"].Text = "enabled"
        }
    }
}

$foo = [MyForm]::new("test")
$foo.ShowDialog()

但此脚本返回以下错误:

Cannot index into a null array.
At C:\Users\wakatana\Desktop\toggle_button_name\forms2.ps1:50 char:13
+         if ($this.parent.controls["status"].text -eq "enabled"){
+             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (:) [], RuntimeException
    + FullyQualifiedErrorId : NullArray

Add-Type -AssemblyName System.Windows.Forms

class MyForm : System.Windows.Forms.Form {
    MyForm($mystuff) {
        #Do-Stuff
        $this.Add_Load( $this.MyForm_Load )
    }

    $MyForm_Load = {
        $mlabel = [System.Windows.Forms.Label]::new()
            $mlabel.Name = "label"
            $mlabel.Text = "disabled"

        $mbutton = [System.Windows.Forms.Button]::new()
            $mbutton.Name = "button"
            $mbutton.Location = [System.Drawing.Point]::new(100,100)
            $mbutton.Add_Click( $this.mbutton_click )

        $this.Controls.Add($mlabel)
        $this.Controls.Add($mbutton)

    # ----------------------------------------------
    # Now $this.controls has something. We can now access it.
    # ----------------------------------------------
        if ($this.controls["label"].text -eq "enabled"){
            $mbutton.text = "disable"
        }else{
            $mbutton.text = "enable"
        }
    }

    $mbutton_click = {
        if ($this.Parent.Controls["label"].Text -eq "enabled"){
            $this.Parent.Controls["label"].Text = "disabled"
            $this.Parent.Controls["button"].Text = "enable"
        }
        else{
            $this.Parent.Controls["label"].Text = "enabled"
            $this.Parent.Controls["button"].Text = "disable"
        }
    }
}

$foo = [MyForm]::new("test")
$foo.ShowDialog()

0 回复 | 直到 5 年前

HAL9256 5 年前

编辑:

$this.parent.controls

因为你还没有在表单中添加任何内容。
因为你在里面 $MyForm_Load $this.parent 就像你一样是父母。只需删除 .parent

E、 g.试图访问空的内容时抛出错误:

$MyForm_Load = {
    $mlabel = [System.Windows.Forms.Label]::new()
    $mlabel.Name = "status"
    $mlabel.Text = "enabled"

    $mbutton = [System.Windows.Forms.Button]::new()

# ----------------------------------------------
# Here - $this.controls is empty trying to access will throw error
# ----------------------------------------------

    if ($this.controls["status"].text -eq "enabled"){
        $mbutton.text = "disable"
    }else{
        $mbutton.text = "enable"
    }

    $mbutton.Location = [System.Drawing.Point]::new(100,100)
    $mbutton.Add_Click( $this.mbutton_click )

# ----------------------------------------------
# Here - this.controls is still empty
# ----------------------------------------------

    $this.Controls.Add($mlabel)
    $this.Controls.Add($mbutton)

# ----------------------------------------------
# Now $this.controls has something.
# ----------------------------------------------

}

之后和通过引用 $this.controls ,您将得到:

$MyForm_Load = {
    $mlabel = [System.Windows.Forms.Label]::new()
    $mlabel.Name = "status"
    $mlabel.Text = "enabled"

    $mbutton = [System.Windows.Forms.Button]::new()

    $mbutton.Location = [System.Drawing.Point]::new(100,100)
    $mbutton.Add_Click( $this.mbutton_click )

    $this.Controls.Add($mlabel)
    $this.Controls.Add($mbutton)

# ----------------------------------------------
# Now $this.controls has something. We can now access it.
# ----------------------------------------------

    if ($this.controls["status"].text -eq "enabled"){
        $mbutton.text = "disable"
    }else{
        $mbutton.text = "enable"
    }
}