如何访问用户控件的项目

Question

I have a C# Form that prints multiple instances of a User Control . Let's say that the form prints 5 instances of the User Control (Please see the link attached). How can I store/save the data inputted in all User Controls? Thanks

Here is the screenshot of the C# Form:

Answer 1

You'll have to store the User Controls when you instantiate them in a List or something.

You could have a class like this:

class SomeUC : UserControl
{
    public SomeUC()
    {
    }

    // A public method.
    public string GetData()
    {
        return textBox1.Text;
    }
}

Where textBox1 is the Name of a TextBox in your SomeUC

And then inside your main or something.

// Instantiate a List that will hold your UserControls, this has to be outside all methods
List<SomeUC> list = new List<SomeUC>();


// And now when you want to build your UCs
// Instantiate your UserControl
SomeUC uc1 = new SomeUC();
// Store your UserControl in a List or something (Can't help you with that)
list.Add(uc1);

Add as much as you want. A List is not the only way you can do that, but since you don't know how many UserControls you're going to build beforehand, it makes since to use a List . And then you can access them from the list by their index.

SomeUC uc1 = list[0];
string data = uc1.GetData();

This is an example of accessing one control (the TextBox ) in your SomeUC . For other classes (such as the ComboBox ) the interaction is different. Meaning you won't have a Text property in the ComboBox . You'll have to figure out things like that on youself. A little research is what it takes. You can always come back if you couldn't find a solution for something.

Answer 2

尝试使用此代码访问页面中的用户控件

Dim txtName As TextBox = TryCast(UserControlName.FindControl("txtName"), TextBox)

Answer 3

You can create a property like this for each item in user control.

public string DG
{
    get
    {
        return txtDG.Text;
    }
    set
    {
        txtDG.Text = value;
    }
}

Then you can access the control value by using following line in your form. supposed you have created a usercontrol MyControl and you have placed some object of this control in FlowLayoutPenal (pnlFLP).

To get value from control

string DG = ((MyControl)pnlFLP.Controls[0]).DG;

To set value in control

((MyControl)pnlFLP.Controls[0]).DG = "1";