C#问题:如何在一个表单上操作另一个表单上的文本框?

时间:2009-02-04 08:22:16

标签: c# .net winforms

我正在尝试为我正在处理的项目创建自己的错误窗口。当我显示我的错误窗口时,我无法将错误消息和用户消息传递给错误窗口,因为在我创建的类中无法看到“ErrorMessage.Text”。

我进入了表单设计器生成的代码,并尝试使TextBox保持静态,但这只会破坏事物。我可以将TextBox设为public / static,以便我可以从另一种形式更改它吗?

  1. 如何创建TextBox Static Public,以便我可以在其他表单中操作它,还是有其他方法可以执行此操作?
  2. 修改

    好的,有关更多信息......

    我创建了自己的表单。它被称为“formErrorWindow”。我需要显示我使用其他表单中的消息集预先设计的表单。我能做到这一点的唯一方法是,如果我在窗体设计器区域中为窗体创建一个Function,并使用“this.errorMsg.text = error”设置变量。我能看到该功能的唯一方法是将其设置为静态。如果我将函数设置为静态,当我尝试将“this.errorMsg.Text = error”时,我得到此错误:非静态字段,方法或属性需要对象引用。

    以下是我的尝试:

        namespace LCR_ShepherdStaffupdater_1._0
        {
            partial class formErrorWindow
            {
                /// <summary>
                /// Required designer variable.
                /// </summary>
                public System.ComponentModel.IContainer components = null;
    
                /// <summary>
                /// Clean up any resources being used.
                /// </summary>
                /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
                /// 
    
                protected override void Dispose(bool disposing)
                {
                    if (disposing && (components != null))
                    {
                        components.Dispose();
                    }
                    base.Dispose(disposing);
                }
    
                #region Windows Form Designer generated code
    
                /// <summary>
                /// Required method for Designer support - do not modify
                /// the contents of this method with the code editor.
                /// </summary>
    // ********* HERE IS THE FUNCTION THAT IVE ADDED BELOW. THIS WOULD WORK BUT.... *********
         public static void showError(string errorTitle, string usrMsg, string errorMsg)
        {
            formErrorWindow errorWindow = new formErrorWindow();
            errorMsgItem.Text = errorMsg;
            errorTitleItem.Text = "Error! : " + errorTitle;
            usrMsgItem.Text = usrMsg;
            errorWindow.ShowDialog();
        }
    // ********* HERE IS THE FUNCTION THAT IVE ADDED ABOVE. THIS WOULD WORK BUT.... *********
    // ********* I get an error: "An object reference is required for the non-static field, method, or property." *********
                public void InitializeComponent()
                {
                    System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typeof(formErrorWindow));
                    this.usrMsgItem = new System.Windows.Forms.TextBox();
                    this.errorTitleItem = new System.Windows.Forms.Label();
                    this.errorMsgItem = new System.Windows.Forms.TextBox();
                    this.button1 = new System.Windows.Forms.Button();
                    this.panel1 = new System.Windows.Forms.Panel();
                    this.label2 = new System.Windows.Forms.Label();
                    this.panel1.SuspendLayout();
                    this.SuspendLayout();
                    // 
                    // usrMsgItem
                    // 
                    this.usrMsgItem.Enabled = false;
                    this.usrMsgItem.Location = new System.Drawing.Point(13, 37);
                    this.usrMsgItem.Multiline = true;
                    this.usrMsgItem.Name = "usrMsgItem";
                    this.usrMsgItem.Size = new System.Drawing.Size(334, 81);
                    this.usrMsgItem.TabIndex = 0;
                    this.usrMsgItem.Text = "Undefined";
                    // 
                    // errorTitleItem
                    // 
                    this.errorTitleItem.AutoSize = true;
                    this.errorTitleItem.Font = new System.Drawing.Font("Microsoft Sans Serif", 12F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
                    this.errorTitleItem.ForeColor = System.Drawing.Color.Red;
                    this.errorTitleItem.Location = new System.Drawing.Point(12, 9);
                    this.errorTitleItem.Name = "errorTitleItem";
                    this.errorTitleItem.Size = new System.Drawing.Size(152, 20);
                    this.errorTitleItem.TabIndex = 1;
                    this.errorTitleItem.Text = "Error! : Undefined";
                    // 
                    // errorMsgItem
                    // 
                    this.errorMsgItem.Enabled = false;
                    this.errorMsgItem.Location = new System.Drawing.Point(0, 21);
                    this.errorMsgItem.Multiline = true;
                    this.errorMsgItem.Name = "errorMsgItem";
                    this.errorMsgItem.Size = new System.Drawing.Size(329, 101);
                    this.errorMsgItem.TabIndex = 2;
                    this.errorMsgItem.Text = "Undefined";
                    // 
                    // button1
                    // 
                    this.button1.Location = new System.Drawing.Point(272, 256);
                    this.button1.Name = "button1";
                    this.button1.Size = new System.Drawing.Size(75, 23);
                    this.button1.TabIndex = 3;
                    this.button1.Text = "Continue";
                    this.button1.UseVisualStyleBackColor = true;
                    this.button1.Click += new System.EventHandler(this.button1_Click);
                    // 
                    // panel1
                    // 
                    this.panel1.BackColor = System.Drawing.Color.FromArgb(((int)(((byte)(255)))), ((int)(((byte)(128)))), ((int)(((byte)(128)))));
                    this.panel1.Controls.Add(this.label2);
                    this.panel1.Controls.Add(this.errorMsgItem);
                    this.panel1.Location = new System.Drawing.Point(12, 124);
                    this.panel1.Name = "panel1";
                    this.panel1.Size = new System.Drawing.Size(335, 126);
                    this.panel1.TabIndex = 4;
                    // 
                    // label2
                    // 
                    this.label2.AutoSize = true;
                    this.label2.Font = new System.Drawing.Font("Microsoft Sans Serif", 10F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
                    this.label2.Location = new System.Drawing.Point(68, 1);
                    this.label2.Name = "label2";
                    this.label2.Size = new System.Drawing.Size(189, 17);
                    this.label2.TabIndex = 3;
                    this.label2.Text = "Technical Error Message";
                    // 
                    // formErrorWindow
                    // 
                    this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
                    this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
                    this.BackColor = System.Drawing.Color.FromArgb(((int)(((byte)(255)))), ((int)(((byte)(192)))), ((int)(((byte)(192)))));
                    this.ClientSize = new System.Drawing.Size(359, 290);
                    this.Controls.Add(this.panel1);
                    this.Controls.Add(this.button1);
                    this.Controls.Add(this.errorTitleItem);
                    this.Controls.Add(this.usrMsgItem);
                    this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedToolWindow;
                    this.Icon = ((System.Drawing.Icon)(resources.GetObject("$this.Icon")));
                    this.MaximizeBox = false;
                    this.MinimizeBox = false;
                    this.Name = "formErrorWindow";
                    this.StartPosition = System.Windows.Forms.FormStartPosition.CenterParent;
                    this.Text = "Error!";
                    this.VisibleChanged += new System.EventHandler(this.formErrorWindow_VisibleChanged);
                    this.panel1.ResumeLayout(false);
                    this.panel1.PerformLayout();
                    this.ResumeLayout(false);
                    this.PerformLayout();
    
                }
    
                #endregion
    
                private System.Windows.Forms.Button button1;
                private System.Windows.Forms.Panel panel1;
                private System.Windows.Forms.Label label2;
                public System.Windows.Forms.TextBox usrMsgItem;
                public System.Windows.Forms.Label errorTitleItem;
                public System.Windows.Forms.TextBox errorMsgItem;
            }
        }
    

    寻找我上面添加的功能。我如何编译并执行我想要它做的事情没有我不断得到的错误:非静态字段,方法或属性需要对象引用。

9 个答案:

答案 0 :(得分:6)

我只是将消息作为构造函数参数传递。

MyMessageBox messageBox = new MyMessageBox("My error message");
messageBox.Show();

答案 1 :(得分:1)

是的!有一个公开的功能,可以收到这个文本:

pseudo: public void updateTextBox(string new_text)

并让函数从那里更新文本框。

不要将UI与逻辑混合。

答案 2 :(得分:1)

public partial class Form1 : Form
    {
        private static TextBox box;

        public Form1()
        {
            InitializeComponent();
        }



        private void Form1_Load(object sender, EventArgs e)
        {

            // box
            box = new TextBox();
            box.Location = new System.Drawing.Point(87, 230);
            box.Name = "box";
            box.Size = new System.Drawing.Size(100, 20);
            box.TabIndex = 1;

            this.Controls.Add(box);

        }
    }

答案 3 :(得分:0)

您可以先将TextBox公开。 第二个创建一个静态表单(表单名称)变量,并在每次加载时将表单放在那里... 这在我眼里不是一个好的解决方案,但是如果不了解你的设计,那么我能想出的最好......

答案 4 :(得分:0)

允许公开访问类中包含的对象可能是一种设计。如何在名为ErrorText的错误窗口类中编写属性,并在该属性中将ErrorMessage.Text设置为传递的字符串?或者我错过了什么?

答案 5 :(得分:0)

如果您真的想直接访问控件:

  public Form2(Form1 form1)
        {
            InitializeComponent();

            Owner = form1;
            _form1 = form1;
        }

现在您可以通过以下方式访问form1上的控件:

_form1.theForm1ControlName

答案 6 :(得分:0)

你可以在Error窗口的类中创建一个类似于:

的方法
public void SetErrorText(string errorText)
{
   this.ErrorMessage.Text = errorText; // assuming the TextBox' ID is ErrorMessage.
}

答案 7 :(得分:0)

通过添加你所做的公共功能听起来你在正确的轨道上,但你不应该让它静止。作为一般规则,如果你必须进入Designer生成的代码,有些东西是不对的,那么让我们离开那里 - 这并不意味着你不能将代码添加到表单中,显然,但不要在那一节做到:)

你得到的错误我相信来自于一个非实例化的对象(即创建错误形式,如:

formErrorWindow myErrorWindow;

而不是像实例化/创建它的实例一样:

formErrorWindow myErrorWindow = new formErrorWindow();

你已经将函数设置为静态,所以你可以从任何地方看到它,但是该函数实际上无法做任何事情,因为它运行的表单在你使用“= new formErrorWindow()之前还不存在; ”

因此,如果我在一个名为“MainForm”的表单中并且我想显示错误,那么使用您提供的函数的名称就可以这样做:

formErrorWindow myErrorWindow = new formErrorWindow();
myErrorWindow.showError("Title", "User Message Here", "Error Message Here");
myErrorWindow.ShowDialog();

关键是要确保没有任何东西是静态的,然后确保你使用= new formErrorWindow()初始化formErrorWindow;

答案 8 :(得分:0)

像这样将TextBox传递给函数/方法

public static void myFunc(TextBox textBox1)
{
    textBox1.Text = "do stuff";
{