c# - 是否可以将属性网格中显示的属性标记为密码字段

Question

我正在使用 C# 并且有一个包含属性网格控件的 Windows 窗体。

我已将 propertygrid 的 SelectedObject 分配给一个设置文件，该文件显示并允许我编辑设置。但是其中一项设置是密码 - 我希望它在字段中显示星号，而不是密码设置的纯文本值。

保存时该字段将被加密，但我希望它的行为类似于普通的密码输入框，当用户输入密码时会显示星号。

我想知道是否有一个属性可以应用于设置属性以将其标记为密码？

谢谢。

Answer 1

从 .Net 2 开始，您可以使用附加到密码属性的PasswordPropertyTextAttribute 。

希望这可以帮助。

Answer 2

我不认为你可以让 PropertyGrid 换成星号，但你也许可以使用单向类型转换器和模态编辑器......像这样：

using System;
using System.ComponentModel;
using System.Drawing.Design;
using System.Windows.Forms;
using System.Windows.Forms.Design;
class Foo
{
    [TypeConverter(typeof(PasswordConverter))]
    [Editor(typeof(PasswordEditor), typeof(UITypeEditor))]
    public string Password { get; set; }

    // just to show for debugging...
    public string PasswordActual { get { return Password; } }
}
class PasswordConverter : TypeConverter
{
    public override object ConvertTo(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value, System.Type destinationType)
    {
        return destinationType == typeof(string) ? "********" : 
            base.ConvertTo(context, culture, value, destinationType);


    }
}
class PasswordEditor : UITypeEditor
{
    public override UITypeEditorEditStyle GetEditStyle(ITypeDescriptorContext context)
    {
        return UITypeEditorEditStyle.Modal;
    }
    public override object EditValue(ITypeDescriptorContext context, IServiceProvider provider, object value)
    {
        IWindowsFormsEditorService svc = (IWindowsFormsEditorService)
            provider.GetService(typeof(IWindowsFormsEditorService));
        if (svc != null) {
            TextBox tb;
            Button btn;
            Form frm = new Form { Controls = {
                 (tb = new TextBox { PasswordChar = '*', Dock = DockStyle.Top,
                     Text = (string)value}),
                 (btn = new Button { Text = "OK", Dock = DockStyle.Bottom, DialogResult = DialogResult.OK})
            }, AcceptButton = btn};

            if (frm.ShowDialog() == DialogResult.OK)
            {
                value = tb.Text;
            }
        }
        return value;
    }
}
static class Program {
    [STAThread]
    static void Main() {
        Application.EnableVisualStyles();
        Application.Run(new Form {
            Controls = {
                new PropertyGrid {
                    Dock = DockStyle.Fill,
                    SelectedObject = new Foo { Password = "Bar"}
                }
            }
        });
    }
}

Answer 3

这是我过去所做的。它在网格中为密码显示“********”，并带有一个“...”按钮以允许用户设置密码（使用您提供的对话框）。

public class User
{
    [TypeConverter(typeof(PasswordConverter))]
    [Editor(typeof(PasswordEditor), typeof(UITypeEditor))]
    public string Password { get; set; }
}

public class PasswordConverter : TypeConverter
{
    public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType)
    {
        if (destinationType == typeof(string)) return true;

        return base.CanConvertTo(context, destinationType);
    }

    public override object ConvertTo(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value, Type destinationType)
    {
        if (destinationType == typeof(string))
        {
            string password = (string)value;

            if (password != null && password.Length > 0)
            {
                return "********";
            }
        }

        return base.ConvertTo(context, culture, value, destinationType);
    }
}

public class PasswordEditor : UITypeEditor
{
    public override object EditValue(ITypeDescriptorContext context, IServiceProvider provider, object value)
    {
        string password = (string)value;

        // Show a dialog allowing the user to enter a password

        return password;
    }

    public override UITypeEditorEditStyle GetEditStyle(ITypeDescriptorContext context)
    {
        return UITypeEditorEditStyle.Modal;
    }
}