我似乎无法在C＃中更改窗体格式文本

Question

I'm using Visual Studio to create a program. So far, it has one window with a button.

in Form1.Designer.cs, it initializes the window:

namespace Test
{
    private void InitializeComponent()
    {
        // I took out everything else, it isn't needed.

        // 
        // formMain
        // 
        this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
        this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
        this.BackColor = System.Drawing.SystemColors.ControlLightLight;
        this.ClientSize = new System.Drawing.Size(624, 442);
        this.Icon = ((System.Drawing.Icon)(resources.GetObject("$this.Icon")));
        this.Name = "formMain";
        this.Text = "Program Name";
        this.Load += new System.EventHandler(this.formMain_Load);
        this.menuBar.ResumeLayout(false);
        this.menuBar.PerformLayout();
        this.ResumeLayout(false);
        this.PerformLayout();

    }
}

In Form1.cs:

    private void button1_Click(object sender, EventArgs e)
    {
        formMain.ActiveForm.Text = formMain.ActiveForm.Text + " - Project Name";
    }

...but it doesn't change the window text after I click the button. I've also tried formMain.ActiveForm.Refresh() after changing the text, but that didn't work. I've search high and low for a solution, but I'm new to C#. Do any of you have any ideas for me?

Answer 1

Did you try something like that?

private void button1_Click(object sender, EventArgs e)
{
    this.Text = "Works!";
}

Answer 2

First, never edit designer.cs code. This is auto-generated and you can break things if you edit the file.

Second, with the code you showed us formMain has not been initialized to anything so it will error out of you try to set properties (such as its Text property). So you have two options:

1. Set formMain to your form (not recommended due to the next option)
2. Use the this object. this refers to the current object you are working with (in this case you are referring to your form).

You can set the form's Text property to change the form's title. For example:

this.Text = "Hello World!";