CODEWITHSUNDEEP
c#textbox
Fatemeh Hojjati
Fatemeh Hojjati

Reputation: 59

I want to constrain my textbox to persian alphabet, how can I do it? In C#

I want a textbox to accept just Persian alphabet, and don't accept any signs in C#. Can anyone help me with code?

Upvotes: 0

Views: 1135

Answers (2)

M.kazem Akhgary
M.kazem Akhgary

Reputation: 19149

You must add event for your textbox. What you want is KeyPress Event.

see this tutorial in DotNet Perls.

C# TextBox Tutorial: TextChanged and KeyDown

private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
{
    e.Handled = !e.KeyChar <= 'BiggestPersianChar' && !e.KeyChar >= 'SmallesPersianChar';
}

Currently i dont know the Biggest persian char and smallest one. but i hope you know it.

Edit:

I Guess that these are biggest and smallest char. by Big and small i mean its Unicode.

e.Handled = !e.KeyChar <= 'ی' && !e.KeyChar >= 'ا';

Upvotes: 1

Bahman_Aries
Bahman_Aries

Reputation: 4798

This is probably what you're looking for:

// Only allows "Persian characters" and "Space".
private void TextBox_KeyPress(object sender, KeyPressEventArgs e)
{
    if (!Regex.IsMatch(e.KeyChar.ToString(), @"\p{IsArabic}")
        && !string.IsNullOrWhiteSpace(e.KeyChar.ToString()))
        e.Handled = true;
}

// Only allows "Persian characters", "Space" and "Numbers".
private void TextBox_KeyPress(object sender, KeyPressEventArgs e)
{
    if (!Regex.IsMatch(e.KeyChar.ToString(), @"\p{IsArabic}")
        && !string.IsNullOrWhiteSpace(e.KeyChar.ToString())
        && !char.IsDigit(e.KeyChar))
        e.Handled = true;
}

Specific character sets in the Unicode standard occupy a specific range or block of consecutive code points. For example, the basic Latin character set is found from \u0000 through \u007F, while the Arabic character set is found from \u0600 through \u06FF. The regular expression construct

\p{ name }

matches any character that belongs to a Unicode general category or named block.

You can read more about Unicode Block here.

Upvotes: 3

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