为啥下面代码创建的文本框和下拉框不能输入值 Grid grid = new Grid;gridRowDefinitionsAddnew RowDefinition Height = new GridLength70 ;gridRowDefinitionsAddnew RowDefinition Height = GridLengthAuto ;gridRowDefinitionsAddnew

因为下面代码中的文本框和下拉框没有设置IsReadOnly属性为false，所以不能输入值：

var text = new TextBox() { Margin = new Thickness(0, 5, 0, 5), FontSize = 17, Foreground = Brushes.Blue, VerticalAlignment = VerticalAlignment.Center, Width = 80 };

要使其能够输入值，需要添加IsReadOnly属性的设置：

var text = new TextBox() { Margin = new Thickness(0, 5, 0, 5), FontSize = 17, Foreground = Brushes.Blue, VerticalAlignment = VerticalAlignment.Center, Width = 80, IsReadOnly = false };

对于下拉框，需要使用ComboBox控件，同样需要设置IsEditable属性为true，才能输入值：

var comboBox = new ComboBox() { Margin = new Thickness(0, 5, 0, 5), FontSize = 17, Foreground = Brushes.Blue, VerticalAlignment = VerticalAlignment.Center, Width = 80, IsEditable = true };

这样就可以在下拉框中输入值了