在 winform 文本框中，哪个密码字符显示黑点(•) ？

简短的问题:

在 .Net 4.0 Winform中，如何使用 Textbox的 PasswordChar属性将一个常见的 黑点显示为 性格？有没有什么字体可以让我用这个字符？

如果我使用‘ UseSystemPasswordChar = true’，它会显示一个星号(*)。

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最佳答案

You can use this one: ●

You can type it by holding Alt and typing 25CF.

Alternately, you may use this smaller one: •

You can type it by holding Alt and typing 2022.

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Use the Unicode Character 'BLACK CIRCLE' (U+25CF) http://www.fileformat.info/info/unicode/char/25CF/index.htm

To copy and paste: ●

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One more solution to use this Unicode black circle >>

Start >> All Programs >> Accessories >> System Tools >> Character Map

Then select Arial font and choose the Black circle copy it and paste it into PasswordChar property of the textbox.

That's it....

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Below are some different ways to achieve this. Pick the one suits you

  1. In fonts like 'Tahoma' and 'Times new Roman' this common password character '●' which is called 'Black circle' has a unicode value 0x25CF. Set the PasswordChar property with either the value 0x25CF or copy paste the actual character itself.

  2. If you want to display the Black Circle by default then enable visual styles which should replace the default password character from '*' to '●' by default irrespective of the font.

  3. Another alternative is to use 'Wingdings 2' font on the TextBox and set the password character to 0x97. This should work even if the application is not unicoded. Refer to charMap.exe to get better idea on different fonts and characters supported.

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I was also wondering how to store it cleanly in a variable. As using 

char c = '•';

is not very good practice (I guess). I found out the following way of storing it in a variable

char c = (char)0x2022;// or 0x25cf depending on the one you choose

or even cleaner

char c = '\u2022';// or "\u25cf"

https://msdn.microsoft.com/en-us/library/aa664669%28v=vs.71%29.aspx

same for strings

string s = "\u2022";

https://msdn.microsoft.com/en-us/library/362314fe.aspx

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Instead of copy/paste a unicode character or setting it in the code-behind you could also change the properties of the TextBox. Simply set "UseSystemPasswordChar" to True and everytghing will be done for you by the Framework. Or in code-behind:

this.txtPassword.UseSystemPasswordChar = true;


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