c# - 从对话框返回值

Question

如何以模态对话框形式发送和返回值

Answer 1

试试这个。它被设计成 MessageBox 的对应物。不过，它不会根据操作系统更改其样式。看起来像 Vista 的。

这是它的实际应用示例，来自它的原始主页(一个 Paint.NET 插件)。它将展开以适应提示。

输入框.cs:

    internal partial class InputBoxForm : Form
    {
        Size lbltextoriginalsize;
        Size pnlwhiteoroginalsize;
        public InputBoxForm(string text, string defaultvalue, string caption)
        {
            InitializeComponent();
            this.pnlWhite.Resize += new System.EventHandler(this.pnlWhite_Resize);
            this.lblText.Resize += new System.EventHandler(this.lblText_Resize);
            picIcon.Image = SystemIcons.Question.ToBitmap();
            lbltextoriginalsize = lblText.Size;
            pnlwhiteoroginalsize = pnlWhite.Size;
            this.lblText.Text = text;
            this.txtOut.Text = defaultvalue;
            this.Text = caption;
        }

        private void lblText_Resize(object sender, EventArgs e)
        {
            pnlWhite.Size += lblText.Size - lbltextoriginalsize;
        }

        private void pnlWhite_Resize(object sender, EventArgs e)
        {
            this.Size += pnlWhite.Size - pnlwhiteoroginalsize;
        }

        public string Value
        {
            get { return txtOut.Text; }
        }
    }

    /// 
    /// A counterpart to the MessageBox class, designed to look similar (at least on Vista)
    /// 
    public static class InputBox
    {
        public static DialogResult Show(string text, out string result)
        {
            return ShowCore(null, text, null, null, out result);
        }
        public static DialogResult Show(IWin32Window owner, string text, out string result)
        {
            return ShowCore(owner, text, null, null, out result);
        }
        public static DialogResult Show(string text, string defaultValue, out string result)
        {
            return ShowCore(null, text, defaultValue, null, out result);
        }
        public static DialogResult Show(IWin32Window owner, string text, string defaultValue, out string result)
        {
            return ShowCore(owner, text, defaultValue, null, out result);
        }
        public static DialogResult Show(string text, string defaultValue, string caption, out string result)
        {
            return ShowCore(null, text, defaultValue, caption, out result);
        }
        public static DialogResult Show(IWin32Window owner, string text, string defaultValue, string caption, out string result)
        {
            return ShowCore(owner, text, defaultValue, caption, out result);
        }

        private static DialogResult ShowCore(IWin32Window owner, string text, string defaultValue, string caption, out string result)
        {
            InputBoxForm box = new InputBoxForm(text, defaultValue, caption);
            DialogResult retval = box.ShowDialog(owner);
            result = box.Value;
            return retval;
        }
    }

InputBox.Designer.cs:

    partial class InputBoxForm
    {
        /// 
        /// Required designer variable.
        /// 
        private System.ComponentModel.IContainer components = null;

        /// 
        /// Clean up any resources being used.
        /// 
        /// true if managed resources should be disposed; otherwise, false.
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Windows Form Designer generated code

        /// 
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// 
        private void InitializeComponent()
        {
            this.pnlWhite = new System.Windows.Forms.Panel();
            this.lblText = new System.Windows.Forms.Label();
            this.picIcon = new System.Windows.Forms.PictureBox();
            this.txtOut = new System.Windows.Forms.TextBox();
            this.btnOK = new System.Windows.Forms.Button();
            this.btnCancel = new System.Windows.Forms.Button();
            this.pnlWhite.SuspendLayout();
            ((System.ComponentModel.ISupportInitialize)(this.picIcon)).BeginInit();
            this.SuspendLayout();
            // 
            // pnlWhite
            // 
            this.pnlWhite.Anchor = ((System.Windows.Forms.AnchorStyles)((((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom)
                        | System.Windows.Forms.AnchorStyles.Left)
                        | System.Windows.Forms.AnchorStyles.Right)));
            this.pnlWhite.BackColor = System.Drawing.Color.White;
            this.pnlWhite.Controls.Add(this.lblText);
            this.pnlWhite.Controls.Add(this.picIcon);
            this.pnlWhite.Controls.Add(this.txtOut);
            this.pnlWhite.Location = new System.Drawing.Point(0, 0);
            this.pnlWhite.Margin = new System.Windows.Forms.Padding(0);
            this.pnlWhite.MinimumSize = new System.Drawing.Size(235, 84);
            this.pnlWhite.Name = "pnlWhite";
            this.pnlWhite.Size = new System.Drawing.Size(235, 84);
            this.pnlWhite.TabIndex = 0;
            // 
            // lblText
            // 
            this.lblText.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom)
                        | System.Windows.Forms.AnchorStyles.Left)));
            this.lblText.AutoSize = true;
            this.lblText.Location = new System.Drawing.Point(64, 26);
            this.lblText.Margin = new System.Windows.Forms.Padding(3, 0, 30, 30);
            this.lblText.MinimumSize = new System.Drawing.Size(159, 0);
            this.lblText.Name = "lblText";
            this.lblText.Size = new System.Drawing.Size(159, 13);
            this.lblText.TabIndex = 2;
            // 
            // picIcon
            // 
            this.picIcon.BackColor = System.Drawing.Color.White;
            this.picIcon.Location = new System.Drawing.Point(25, 26);
            this.picIcon.Name = "picIcon";
            this.picIcon.Size = new System.Drawing.Size(32, 32);
            this.picIcon.TabIndex = 1;
            this.picIcon.TabStop = false;
            // 
            // txtOut
            // 
            this.txtOut.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Left)
                        | System.Windows.Forms.AnchorStyles.Right)));
            this.txtOut.Location = new System.Drawing.Point(67, 50);
            this.txtOut.Name = "txtOut";
            this.txtOut.Size = new System.Drawing.Size(159, 20);
            this.txtOut.TabIndex = 5;
            // 
            // btnOK
            // 
            this.btnOK.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Right)));
            this.btnOK.DialogResult = System.Windows.Forms.DialogResult.OK;
            this.btnOK.Location = new System.Drawing.Point(42, 96);
            this.btnOK.Name = "btnOK";
            this.btnOK.Size = new System.Drawing.Size(88, 26);
            this.btnOK.TabIndex = 3;
            this.btnOK.Text = "OK";
            this.btnOK.UseVisualStyleBackColor = true;
            // 
            // btnCancel
            // 
            this.btnCancel.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Right)));
            this.btnCancel.DialogResult = System.Windows.Forms.DialogResult.Cancel;
            this.btnCancel.Location = new System.Drawing.Point(138, 96);
            this.btnCancel.Name = "btnCancel";
            this.btnCancel.Size = new System.Drawing.Size(88, 26);
            this.btnCancel.TabIndex = 4;
            this.btnCancel.Text = "Cancel";
            this.btnCancel.UseVisualStyleBackColor = true;
            // 
            // InputBoxForm
            // 
            this.AcceptButton = this.btnOK;
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.CancelButton = this.btnCancel;
            this.ClientSize = new System.Drawing.Size(235, 133);
            this.Controls.Add(this.btnCancel);
            this.Controls.Add(this.btnOK);
            this.Controls.Add(this.pnlWhite);
            this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle;
            this.MaximizeBox = false;
            this.MinimizeBox = false;
            this.Name = "InputBoxForm";
            this.ShowIcon = false;
            this.ShowInTaskbar = false;
            this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
            this.pnlWhite.ResumeLayout(false);
            this.pnlWhite.PerformLayout();
            ((System.ComponentModel.ISupportInitialize)(this.picIcon)).EndInit();
            this.ResumeLayout(false);

        }

        #endregion

        private System.Windows.Forms.Panel pnlWhite;
        private System.Windows.Forms.PictureBox picIcon;
        private System.Windows.Forms.Label lblText;
        private System.Windows.Forms.Button btnOK;
        private System.Windows.Forms.Button btnCancel;
        private System.Windows.Forms.TextBox txtOut;
    }