从单独的表单更改另一个表单的值(解决方案不起作用) [英] Changing values of another form from a separate form (solution not working)
问题描述
人民.今天我试图从单独的表单更改面板的背景图像.我看过几个 S.O.问题，他们都说要创建一个新的表单变量并更改它的值.所以，我已经这样做了，我没有得到任何错误，但我也没有得到对背景的任何更改.这就是我的意思:(这是我试图改变的主要形式)
peoples. Today I'm attempting to change the background image of a panel from a separate form. I've looked at a few S.O. questions and they have all said to create a new form variable and change it's values. So, I've done this, and I don't get any errors, but I also don't get any change to the background. Here's what I mean: (this is the main form I'm trying to change)
public static void changeGridSize(int newSize)
{
Form_Main frm = new Form_Main();
switch (newSize)
{
case 16:
frm.panelBoard.BackgroundImage = Properties.Resources.grid_16;
break;
case 32:
frm.panelBoard.BackgroundImage = Properties.Resources.grid_32;
break;
case 64:
frm.panelBoard.BackgroundImage = Properties.Resources.grid_64;
break;
case 128:
frm.panelBoard.BackgroundImage = Properties.Resources.grid_128;
break;
}
}
这是另一种形式:
int newSize = 16;
Form_Main.changeGridSize(newSize);
这很可能是愚蠢的事情，但我对这个很困惑.
It's most likely something stupid but I'm stumped on this one.
编辑
这里是文件
主要形式
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace LWJSGL_Level_Editor
{
public partial class Form_Main : Form
{
public static int gridSize = 32;
public Image pbg
{
get { return this.panelBoard.BackgroundImage; }
set { this.panelBoard.BackgroundImage = value; }
}
public String curTile = "";
public Form_Main()
{
InitializeComponent();
}
private void Form_Main_Load(object sender, EventArgs e)
{
}
private void buttonTile_Click(object sender, EventArgs e)
{
//show file dialog
openFileDialogTile.ShowDialog();
}
private void openFileDialogTile_FileOk(object sender, CancelEventArgs e)
{
curTile = openFileDialogTile.FileName;
Msg(curTile);
}
public void Msg(String str)
{
MessageBox.Show(str);
}
private void buttonSettings_Click(object sender, EventArgs e)
{
Form_Settings fs = new Form_Settings();
fs.ShowDialog();
}
public void changeGridSize(int newSize)
{
switch (newSize)
{
case 16:
this.panelBoard.BackgroundImage = Properties.Resources.grid_16;
break;
case 32:
this.panelBoard.BackgroundImage = Properties.Resources.grid_32;
break;
case 64:
this.panelBoard.BackgroundImage = Properties.Resources.grid_64;
break;
case 128:
this.panelBoard.BackgroundImage = Properties.Resources.grid_16;
break;
}
}
}
}
其他形式
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace LWJSGL_Level_Editor
{
public partial class Form_Settings : Form
{
int newSize;
public Form_Settings()
{
InitializeComponent();
}
private void buttonSaveSettings_Click(object sender, EventArgs e)
{
//save settings
Form_Main.gridSize = newSize;
Form_Main frm = new Form_Main();
frm.changeGridSize(newSize);
this.Close();
}
private void radioButtonGridSize16_CheckedChanged(object sender, EventArgs e)
{
newSize = 16;
}
private void radioButtonGridSize32_CheckedChanged(object sender, EventArgs e)
{
newSize = 32;
}
private void radioButtonGridSize64_CheckedChanged(object sender, EventArgs e)
{
newSize = 64;
}
private void radioButtonGridSize128_CheckedChanged(object sender, EventArgs e)
{
newSize = 128;
}
private void Form_Settings_Load(object sender, EventArgs e)
{
switch (Form_Main.gridSize)
{
case 16:
this.radioButtonGridSize16.Checked = true;
break;
case 32:
this.radioButtonGridSize32.Checked = true;
break;
case 64:
this.radioButtonGridSize64.Checked = true;
break;
case 128:
this.radioButtonGridSize128.Checked = true;
break;
}
}
}
}
Extension method must be defined in non-generic static class 错误发生在主窗体的第 13 行.
The Extension method must be defined in non-generic static class error is occuring on line 13 of the main form.
推荐答案
您的其他"表单需要主表单 (Form_Main) 的一个实例，您已将其存储为名为 frm.使用此变量，您可以调用主表单实例，如下所示:
Your "other" form needs an instance of the main form (Form_Main), which you have stored as a variable named frm. With this variable you can call the main form instance, like this:
frm.changeGridSize(newSize);
相反，您正在尝试使用以下语法调用表单，就像它是静态类一样:
Instead you are trying to call the form like it is a static class by using the syntax:
Form_Main.changeGridSize(newSize);
要获取主窗体的实例到其他"窗体，可以将其传递给另一个窗体的构造函数，如下所示:
To get the instance of the main form to the "other" form, you can pass it to the constructor of the other form, like this:
public class OtherForm : Form
{
Main_Form _mainForm;
// Constructor
public OtherForm(Main_Form theMainForm)
{
_mainForm = theMainForm;
}
public static void changeGridSize(int newSize)
{
_mainForm.changeGridSize(newSize);
}
}
最后，当您创建其他"表单时，您需要传递主表单的一个实例，如下所示:
Finally, when you are creating your "other" form, you will need to pass an instance of the main form, like this:
OtherForm theOtherForm = new OtherForm(this);
这篇关于从单独的表单更改另一个表单的值(解决方案不起作用)的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
