在RichTextBox中打印彩色文字

Question

我正在RichTextBox中寫入文字。

如何在紅色中打印lineItems和j + 1變量。

例如（以粗體=紅色）：元Growthougth在列，一直沒有writen右。

private void button2_Click(object sender, EventArgs e) 
      { 
// Numbers-IDs 
     if (colB[j] == "int_number") 
     { 
      if (!arithmos(lineItems[j])) 
       richTextBox1.Text += "Element " + lineItems[j] + "\t in " + (j + 1) + "th coloumn,has not been writen right" + Environment.NewLine; 
     } 

// Alphanumeric 
     else if (colB[j] == "alpharithmitiko") 
     { 
       if (!numword(lineItems[j])) 
        richTextBox1.Text += "Element " + lineItems[j] + " in " + (j + 1) + "th coloumn,has not been writen right " + Environment.NewLine; 
     } 



//Words 
     else if (colB[j] == "words") 
     { 
       if (!word(lineItems[j])) 
        richTextBox1.Text += "Το στοιχείο " + lineItems[j] + " in " + (j + 1) + "th coloumn,has not been writen right" + Environment.NewLine; 
     } 
//Date 
     else if (colB[j] == "date") 
     { 
      if (!date(lineItems[j])) 
       richTextBox1.Text += "Το στοιχείο " + lineItems[j] + " in " + (j+1) + "th coloumn,has not been writen right" + Environment.NewLine; 
      } 
} 

Answer 1

你可以試試這個..

if (!arithmos(lineItems[j])) 
richTextBox1.Text += "Element " + lineItems[j] + "\t in " + (j + 1) + "th coloumn,has not been writen right" + Environment.NewLine; 
richTextBox1.SelectionColor = Color.Red; 
richTextBox1.AppendText(j + 1);