TEXTBOX回车换行

TEXTBOX回车换行

要用到p/invoke。以下为代码。

this.GetWordWrappedText(this.textBox)会把自动折行转成硬回车。

using System.Runtime.InteropServices;

[DllImport("user32.dll")]

static extern int SendMessage(IntPtr hWnd, int wMsg, int wParam, int lParam);

[DllImport("user32.dll", CharSet=CharSet.Unicode)]

static extern int SendMessage(IntPtr hWnd, int wMsg, int wParam, StringBuilder lParam);

const int EM_GETLINE = 0xc4;

const int EM_GETLINECOUNT = 0xba;

string GetWordWrappedText(TextBoxBase textBox)

{

int count = SendMessage(textBox.Handle,

EM_GETLINECOUNT, 0, 0);

string[] lines = new string[count];

for (int i = 0; i < count; ++i)

lines[i] = this.GetLine(textBox, i);

return string.Join("\r\n", lines);

}

string GetLine(TextBoxBase textBox, int index)

{

StringBuilder buffer = new StringBuilder("\uffff".PadRight(0xffff));

int count = SendMessage(textBox.Handle, EM_GETLINE, index,

buffer);

return buffer.ToString(0, count);

}

private void button1_Click(object sender, EventArgs e)

{

MessageBox.Show(this.GetWordWrappedText(this.textBox1));

}