How Can I Pass a String Value from a Child Form to a Parent Form?

Pass data between parent form and child form

Many programming scenarios require exchanging data between parent and child forms. For example, a subform displays the user interface, and you need to retrieve a value from the subform and use it in the parent form.

How to return a string value to the parent form?

To pass values ​​from a child form back to the parent form, follow these steps:

1. Define a property or method in the subform: Create a property or method in the subform to retrieve the value to be passed back. In this case, you need to pass a string. For example, you can create an attribute called GetValue().

2. Open the subform: Use the new keyword to instantiate the subform and specify the parent form in the constructor, for example:

   using (FormOptions formOptions = new FormOptions(this))
   {
       // 使用 formOptions 的逻辑
   }

3. Update subform: In the subform, update a property or method with the value you want to return.

4. Retrieve the value in the parent form: After closing the child form, you can access the value by calling a property or method on the child form instance, for example:

   string result = formOptions.GetValue();

Here is a code example:

// 子窗体 (FormOptions) 中的代码
private string _myResult;

public string GetMyResult
{
    get { return _myResult; }
    set { _myResult = value; }
}

// 父窗体中的代码
using (FormOptions formOptions = new FormOptions(this))
{
    formOptions.ShowDialog();

    string result = formOptions.GetMyResult;

    // 使用 result ...
}

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