從另一個類訪問窗體控件​​

Question

我有一個windows窗體應用程序，其中一些控件添加到設計器中。當我想改變的東西（像）從Form1.cs的內啓用一個文本框

我簡單地使用

textBox1.Enabled = true; 

，但現在我已經叫分離類的Class1.cs

怎麼可能我啓用textBox1從一個靜態函數class1.cs？

{NOTE}我沒有試過任何代碼，因爲我完全無法做到這一點。

Answer 1

編輯：很多的編輯。

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 2

你可以讓你的class1有一個事件來啓用文本框。

public class Class1 
{ 
    public event Action<object, EventArgs> subscribe ; 
    private void raiseEvent() 
    { 
    var handler = subscribe ; 
    if(handler!=null) 
    { 
     handler(this,EventArgs.Empty);//Raise the enable event. 
    } 
    } 
} 

讓包含TextBox的類以某種方式訂閱它。在文本框包裝類

public class TextBoxWrapper 
     public void EnablePropertyNotification(object sender, EventArgs args) 
     { 
      TextBox1.Enabled = true ; //Enables textbox when event is raised. 
     } 
     public TextBoxWrapper() 
     { 
     class1Instance.subscribe+=EnablePropertyNotification ; 
     } 

Answer 3

您可以將表格的實例傳遞到類

MyForm frm = new MyForm(); 

MyClass c = new MyClass(frm); 

然後你的類可以採取的實例和訪問文本框

public class MyClass 
{ 

    public MyClass(MyForm f) 
    { 
     f.TextBox1.Enabled = false; 
    } 
} 

設計確實不好看

最好在窗體中調用該類，並基於val UE反饋，操縱文本框

//MyForm Class 

MyClass c = new MyClass(); 
c.DoSomethings(); 
if(c.getResult() == requiredValue) 
    textBox1.enabled = true; 
else 
    textBox1.enabled = false; 

//MyForm Class ends here 

UPDATE

public class Class1 
{ 
    public static int SomeFunction() 
    { 
     int result = 1; 
     return result; 
    } 

    public static void SomeFunction(out int result) 
    { 
     result = 1; 
    } 
} 

使用

if(Class1.SomeFunction() == 1) 
    textBox1.Enabled = true; 
else 
    textBox1.Enabled = false; 

OR

int result = 0; 
Class1.SomeFunction(out result); 

if(result == 1) 
    textBox1.Enabled = true; 
else 
    textBox1.Enabled = false; 

Answer 4

你真的不應該改變您的Form中的UI控件從您的類1，而是創建一個方法或屬性class1，它將告訴是否應該啓用文本框。

例子：

// 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; } } 
} 

然後在您的形式：

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); 

Answer 5

這是你應該怎麼做：

public static Form1 form = null; 

    private delegate void SetImageDelegate(Image image); 

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

    public static void SetStaticImage(Image image) 
    { 
     if (form != null) 
      form.pic1.Image = image; 
    } 

    private void setImage(Image img) 
    { 
     // 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 SetImageDelegate(setImage), new object[] { img }); 
      return; // Important 
     } 

     // Set textBox 
     pic1.Image = img; 
    } 

： 我在表單類寫了下面的代碼並且下面的代碼應該屬於其他類：

Form1 frm= Form1.form; 
frm.pic1.Image = image; 

注意，我改變private static Form1 form = null;到public static Form1 form = null;

好運...寫的哈桑Eskandari :)

Answer 6

這只是另一種方法：

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