Visual Studio 如何删除文本框的顶部和两侧边框

klh5stk1  于 2023-10-23  发布在  其他
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我与斗争如何删除顶部和文本框的Windows窗体项目的双方边界
我希望TextBox看起来像这样：

我的文本框代码：

  1. this.textBox1.Anchor = System.Windows.Forms.AnchorStyles.None;
  2. this.textBox1.Location = new System.Drawing.Point(85, 101);
  3. this.textBox1.Name = "textBox1";
  4. this.textBox1.PlaceholderText = "Login";
  5. this.textBox1.Size = new System.Drawing.Size(213, 23);
  6. this.textBox1.TabIndex = 0;
  7. this.textBox1.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;

你能帮我一下吗？

visual-studio

2条答案

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lfapxunr

lfapxunr1#

首先，快速肮脏的解决方案

创建一个带有重复下划线字符的Label，并将其定位在登录TextBox的底部：

  1. txtName.BorderStyle = BorderStyle.None;
  2. Label lblBottomBorder = new Label();
  3. lblBottomBorder.ForeColor = Color.Blue;
  4. lblBottomBorder.Width = txtName.Width + 8;
  5. lblBottomBorder.Text = new String('_', 250);
  6. lblBottomBorder.Location = new Point(txtName.Location.X - 3, txtName.Location.Y + 3);
  7. Controls.Add(lblBottomBorder);

编辑：

第二种更灵活的解决方案

重新配置Form.OnPaint()方法，并使用Graphics.DrawLine()方法在登录名TextBox下绘制一条自定义线：

  1. public partial class FrmLogin : Form
  2. {
  3.     public FrmLogin()
  4.     {
  5.         InitializeComponent();
  6.         Text = "Login";
  7.         StartPosition = FormStartPosition.CenterScreen;
  8.         MaximizeBox = false;
  9.         MinimizeBox = false;
  10.         FormBorderStyle = FormBorderStyle.FixedDialog;
  11.         Font = new Font("Segoe UI", 10);
  12.         BackColor = Color.White;
  13.         AcceptButton = btnOK;
  14.         Activated += (sender, e) => txtEmail.PlaceholderText = "Email, phone or Skype";
  16.         lblEnter.Font = new Font("Segoe UI", 14, FontStyle.Bold);
  17.         txtEmail.BorderStyle = BorderStyle.None;
  18.         txtEmail.ForeColor = Color.DimGray;
  20.         btnOK.BackColor = Color.DarkBlue;
  21.         btnOK.ForeColor = Color.White;
  22.     }
  24.     protected override void OnPaint(PaintEventArgs e)
  25.     {
  26.         Point txtEmailLocation = PointToClient(PointToScreen(txtEmail.Location));
  27.         var lineStart = new Point(txtEmailLocation.X, txtEmailLocation.Y + txtEmail.Height + 7);
  28.         var lineEnd = new Point(txtEmailLocation.X + txtEmail.Width, txtEmailLocation.Y + txtEmail.Height + 7);
  29.         Pen pen = new Pen(Color.Blue) { Width = 2 };
  30.         e.Graphics.DrawLine(pen, lineStart, lineEnd);
  31.     }
  32. }

请注意，TextBox.PlaceholderText属性需要.NET 5+。登录表单的屏幕截图是：

不像微软的页面那么优雅，但它可以完成工作。

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xytpbqjk

xytpbqjk2#

试试这个简单的UserControl。它只包含一个标准的TextBox控件，并添加了一些属性来定义新的行为。

  • 它提供了自定义的背景绘画，在底部显示一个可调整大小的线条
  • 允许更改底线的颜色
  • 根据当前文本框大小自动调整大小（例如，当您更改字体时）
  • 当文本为空时，可以设置提示横幅（灰色文本）
  • 允许在输入框用于输入密码时设置替换字符
  • 允许从右到左布局

你当然可以添加其他的东西，你去（例如，添加一些图形元素，这是很简单的）

构建此UserControl：

  • 向项目中添加一个新的UserControl，命名为TextBoxInput（目前）
  • 将其Width设置为150
  • 将其Padding设置为(3, 10, 3, 1)和BorderStyle = None
  • 设置其AutoScaleMode = Dpi
  • 添加一个文本框，将其命名为EditControl并将其停靠到Top
  • 更改UserControl的BackColor和ForeColor属性以匹配TextBox的属性
  • 将代码文件中的内容替换为此处的代码（保留namespace）
  • 生成项目，在工具箱中找到UserControl并将其放到窗体上
  1. using System;
  2. using System.Collections;
  3. using System.ComponentModel;
  4. using System.Drawing;
  5. using System.Runtime.InteropServices;
  6. using System.Windows.Forms;
  7. using System.Windows.Forms.Design;
  9. [Designer(typeof(TextBoxInputDesigner))]
  10. public partial class TextBoxInput : UserControl {
  11.     private string m_CueBanner = string.Empty;
  12.     private bool m_CueBannerShowOnFocus = true;
  13.     private Color m_LineColor = Color.CadetBlue;
  14.     private int m_LineDistance = 4;
  15.     private int m_LineHeight = 1;
  17.     public TextBoxInput() {
  18.         InitializeComponent();
  19.         ResizeRedraw = true;
  20.         Padding = new Padding(3, 10, 3, 1);
  21.         EditControl.TextChanged += (_, __) => OnTextChangedInternal(EditControl.Text, false);
  22.         EditControl.HandleCreated += (_, __) => SetCueBanner(EditControl.Handle, m_CueBanner, m_CueBannerShowOnFocus);
  23.         CueBanner = "<Enter CueBanner>";
  24.     }
  26.     public string CueBanner { 
  27.         get => m_CueBanner;
  28.         set {
  29.             m_CueBanner = value;
  30.             SetCueBanner(EditControl.Handle, m_CueBanner, m_CueBannerShowOnFocus);
  31.         } 
  32.     }
  34.     [DefaultValue(true)]
  35.     public bool CueBannerShowOnFocus { 
  36.         get => m_CueBannerShowOnFocus; 
  37.         set {
  38.             m_CueBannerShowOnFocus = value;
  39.             SetCueBanner(EditControl.Handle, m_CueBanner, m_CueBannerShowOnFocus);
  40.         }
  41.     }
  43.     public Color LineColor {
  44.         get => m_LineColor;
  45.         set {
  46.             m_LineColor = value;
  47.             Invalidate();
  48.         }
  49.     }
  51.     [DefaultValue(1), Description("Sets the height of the Line. Allowed values (1, 8)")]
  52.     public int LineHeight {
  53.         get => m_LineHeight;
  54.         set {
  55.             m_LineHeight = Math.Max(1, Math.Min(value, 8));
  56.             Invalidate();
  57.             OnResize(EventArgs.Empty);
  58.         }
  59.     }
  61.     [DefaultValue(false)]
  62.     public bool IsPassword { 
  63.         get => EditControl.UseSystemPasswordChar;
  64.         set => EditControl.UseSystemPasswordChar = value;
  65.     }
  67.     [Bindable(true), Browsable(true), EditorBrowsable(EditorBrowsableState.Always)]
  68.     [DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]
  69.     public override string Text {
  70.         get => base.Text; 
  71.         set {
  72.             OnTextChangedInternal(value, true);
  73.         } 
  74.     }
  76.     protected override void OnBackColorChanged(EventArgs e) {
  77.         base.OnBackColorChanged(e);
  78.         EditControl.BackColor = base.BackColor;
  79.     }
  81.     protected override void OnForeColorChanged(EventArgs e) {
  82.         base.OnForeColorChanged(e);
  83.         EditControl.ForeColor = base.ForeColor;
  84.     }
  86.     protected override void OnLayout(LayoutEventArgs e) {
  87.         base.OnLayout(e);
  88.         ClientSize = new Size(ClientSize.Width, EditControl.Bounds.Bottom + m_LineDistance + m_LineHeight + 1);
  89.     }
  91.     protected override void OnPaintBackground (PaintEventArgs e) {
  92.         base.OnPaintBackground(e);
  93.         int yPos = EditControl.Bounds.Bottom + m_LineDistance + (m_LineHeight / 2);
  94.         using (var pen = new Pen(m_LineColor, m_LineHeight)) {
  95.             e.Graphics.DrawLine(pen, 0, yPos, ClientSize.Width, yPos);
  96.         }
  97.     }
  99.     protected override void OnRightToLeftChanged(EventArgs e) {
  100.         base.OnRightToLeftChanged(e);
  101.         EditControl.RightToLeft = RightToLeft;
  102.     }
  104.     internal virtual void OnTextChangedInternal(string text, bool internalCall) {
  105.         base.Text = text;
  106.         if (internalCall) EditControl.Text = text;
  107.         OnTextChanged(EventArgs.Empty);
  108.         SetCueBanner(EditControl.Handle, m_CueBanner, m_CueBannerShowOnFocus);
  109.     }
  111.     public void SetCueBanner(IntPtr handle, string text, bool showOnFocus) {
  112.         if (handle != IntPtr.Zero) {
  113.             SendMessage(handle, EM_SETCUEBANNER, showOnFocus ? 1 : 0, text);
  114.         }
  115.     }
  117.     private const int EM_SETCUEBANNER = 0x1501;
  119.     [DllImport("user32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
  120.     private static extern int SendMessage(IntPtr hWnd, int msg, int wParam, string lParam);
  121. }

自定义设计器。这只是用来删除一些不相关的属性和分配给控件的默认文本（因此显示提示横幅）。

要在.NET 5+应用程序中使用设计器，请通过NuGetPackage Manager安装Microsoft.WinForms.Designer.SDK支持。

  1. public class TextBoxInputDesigner : ControlDesigner {
  2.     private readonly string[] RemovedProperties = new[] {
  3.             "AutoSize", "AutoSizeMode", "AutoScroll", "AutoScrollMargin","AutoScrollMinSize",
  4.             "BackgroundImage", "BackgroundImageLayout", "Cursor"
  5.         };
  7.     public TextBoxInputDesigner() { }
  9.     public override void InitializeNewComponent(IDictionary defaultValues) {
  10.         base.InitializeNewComponent(defaultValues);
  12.         var descriptor = TypeDescriptor.GetProperties(Component)["Text"];
  13.         if (descriptor != null && (descriptor.PropertyType == typeof(string))) {
  14.             descriptor.SetValue(Component, string.Empty);
  15.         }
  16.     }
  18.     protected override void PreFilterProperties(IDictionary properties) {
  19.         foreach (string prop in RemovedProperties) {
  20.             properties.Remove(prop);
  21.         }
  22.         base.PreFilterProperties(properties);
  23.     }
  24. }

它是这样工作的：

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