从另一个类访问表单控件

Question

我有一个Windows窗体应用程序,其中一些控件添加到设计器中.当我想要更改某些内容(LIKE)时从Form1.cs中启用一个文本框

我只是用

textBox1.Enabled = true;

但现在我有一个名为class1.cs的分离类

我如何从静态函数class1.cs启用textBox1？

{注意}我没有尝试任何代码,因为我完全不知道这样做.

Answer 1

这只是另一种方法：

TextBox t = Application.OpenForms["Form1"].Controls["textBox1"] as TextBox;

Answer 2

编辑:很多编辑.

public partial class Form1 : Form
{
    // Static form. Null if no form created yet.
    private static Form1 form = null;

    private delegate void EnableDelegate(bool enable);

    public Form1()
    {
        InitializeComponent();
        form = this;
    }

    // Static method, call the non-static version if the form exist.
    public static void EnableStaticTextBox(bool enable)
    {
        if (form != null)
            form.EnableTextBox(enable);
    }

    private void EnableTextBox(bool enable)
    {
        // If this returns true, it means it was called from an external thread.
        if (InvokeRequired)
        {
            // Create a delegate of this method and let the form run it.
            this.Invoke(new EnableDelegate(EnableTextBox), new object[] { enable });
            return; // Important
        }

        // Set textBox
        textBox1.Enabled = enable;
    }
}

Answer 3

You shouldn't really change UI controls in your Form from your class1, but instead create a method or a property in class1 that would tell if the textbox should be enabled or not.

Example:

// I changed the name class1 to MySettings
public class MySettings
{
    public bool ShouldTextBoxBeEnabled()
    {
        // Do some logic here.
        return true;
    }

    // More generic
    public static bool SetTextBoxState(TextBox textBox)
    {
        // Do some logic here.
        textBox.Enabled = true;
    }

    // Or static property (method if you like)
    public static StaticShouldTextBoxBeEnabled { get { return true; } }
}

Then in your form:

MySettings settings = new MySettings();
textBox1.Enabled = settings.ShouldTextBoxBeEnabled();

// Or static way
textBox1.Enabled = MySettings.StaticShouldTextBoxBeEnabled;

// Or this way you can send in all textboxes you want to do the logic on.
MySettings.SetTextBoxState(textBox1);