CODEWITHSUNDEEP
c#.netwinforms
user1108948
user1108948

Reputation:

Passing variables in Windows Forms

I have a very complicated windows application which has 8 forms. There are "Previous" and "Next" buttons on each form to back and forth for easily editing forms. 

 private void ShowNext()
    {
        if (FormNext == null)
            FormNext = new SomeForm(this);
        FormNext.Show();
        this.Hide();
    }

    private void ShowPrev()
    {
        FormPrev.Show();
        this.Hide();
    }

    private void btnNext_Click(object sender, EventArgs e)
    {
        ShowNext();
    }

    private void btnBack_Click(object sender, EventArgs e)
    {
        ShowPrev();
    }

Each form will execute different sql insert table command. But the question is that I don't want to finish all insertion on each form.

What I want to is to finish all in the last form once the user confirms the correct input values. That means I have to pass all variables from the very beginning to the last one.

Question: can the memory hold all variables? How to pass them cross forms?

Thanks.

Upvotes: 0

Views: 3218

Answers (4)

Habib
Habib

Reputation: 223402

Define a static public field in your main form, and update the value in each sub forms. Finally select the field in your last form for insertion

Something on the following lines:

public partial class Form1 : Form //your main fomr
    {
        public static List<MyContainerClass> myContainer= new List<MyContainerClass>();
        .............

Here MyContainerClass could be some class defined in your code, which can hold all the values you want to persist. If its just a string, then you may create a list of string. Then in each form set value 

Form1.myContainer.Add(new_values);

In the last form you can access the values

foreach(MyContainerClass mc in Form1.myContainer)
{
//Do your work
}

Upvotes: 1

Vinoth Kannan
Vinoth Kannan

Reputation: 69

You can pass your string queries easily to your new/old form's public variable like below

protected void btnNext_Click(object sender, EventArgs e)
{
    MyForm2 x = new MyForm2();
    x.Query = "My Query";   // here "Query" is your custom public string variable on form2
    x.Show()
}

Upvotes: 1

Tejs
Tejs

Reputation: 41256

You just need to hold a reference to some context that has access to the data you need. 

protected void btnNext_Click(object sender, EventArgs e)
{
    SomeContext.Push(myFormStateDataThatIsReady);
    ShowNext();
}

Then, when the final step comes around, you can pull this data off that context and write that data.

Upvotes: 0

animaonline
animaonline

Reputation: 3804

Create a static singleton class that will hold all your variables.

Upvotes: 0

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