如何知道在RichText框中是否已替换文本ix

Question

This is my code that i use:

Richtextbox.Text = Richtextbox.Text.Replace(ReplaceOldWord, ReplaceNewWord);

How do I know if the old word is replaced with new word or not....

Answer 1

Fist way is to check if text changed:

    String text = Richtextbox.Text.Replace(ReplaceOldWord, ReplaceNewWord);
    if(RichTextBox.Text != text)
    {
        Richtextbox.Text = text;
        DoSomething();
    }

The second is to use TextChanged Event . This event will rize only if richtextbox text changes.

public Form()
{
    InitializeComponent();
    RichTextBox.TextChanged += Richtextbox_TextChanged;
}

private void Richtextbox_TextChanged(object sender, EventArgs e)
{
    DoSomething();
}

Answer 2

我不确定这一点，但是如果您有一个文本框，我认为您有GUI，只需尝试在此打印单词或使用streamwriter器将单词保存在文本文件中即可。

Answer 3

If将在替换之前调用String.Contains如果它返回true，则返回与RichTextBox中相同的旧单词：

var replaced = Richtextbox.Text.Contains(ReplaceOldWord);

Answer 4

You can write code as this:

richTextBox1.Text = richTextBox1.Text.Replace("old", "new");
if (richTextBox1.Text.Contains("old"))
{
  MessageBox.Show("Not replaced");
  //further actions
}