如何在使用SPLIT后更改RichTextBox上的字体颜色 [英] How to Change Font Color on RichTextBox after USING SPLIT

问题描述

Hello Master / Programmer。


我正在尝试使用Split（），在使用它之后，我想检查一下RTB上的输入==我的点然后改变字体颜色在RTB上。就像这个例子一样。



输入RTB：切尔西是我最喜欢的足球俱乐部。我喜欢踢足球


我的观点：足球。



然后我拆分输入，然后我检查arr每个索引的拆分结果。


最后，找到ex： arr [4]和[9] =足球



然后，如何在RTB屏幕上更改字体颜色，如切尔西是我最喜欢的 football 。我喜欢玩 football 俱乐部。？



这是我的代码示例：

Hello Master / Programmer.

I''m trying to use Split(), after using it, i wanna check if the input on RTB == my point then change font color on RTB. Like this example.

INPUT on RTB : Chelsea is my favorite football club. I like playing football

My point : football.

Then I split the input, then i check the result of split in arr each index.

Finally, found ex : arr[4] and [9] = football

Then, how to change font color on RTB screen like
"Chelsea is my favorite football. I like playing football club."?

This my code example :

ArrayList arrInput = new ArrayList();
//if the input Chelsea is my favorite football club. I like playing football
string allInput = rtbInput.Text;

string[] splitString = allInput.Split(new char[] { ' ', '\t', ',', '.'});

foreach (string s in splitString)
{
    if (s.Trim() != "")
    {
         int selectionStart = s.ToLower().IndexOf("football");

         if (selectionStart != -1)
         {
             rtbInput.SelectionStart = selectionStart;
             rtbInput.SelectionLength = ("football").Length;
             rtbInput.SelectionColor = Color.Red;
         }
}
//What Next?? We know that football on arrInput[4].ToString() and [9]
//How to change font color on RTB screen when the input == football

时，如何在RTB屏幕上更改字体颜色

推荐答案

这里有一些问题。



有一个未使用的变量，

Hi,
There are few things wrong here.

There is an unused variable,

ArrayList arrInput = new ArrayList();

我不知道为什么你有这个变量。



这个字符串被分成单词然后预约单词a寻找单词football并得到该单词的索引

I am not sure why you have this variable for.

The string has been split into words and then foreach word a looking for the word "football" and getting the index of that word

int selectionStart = s.ToLower().IndexOf("football");

这将始终将selectionSrart返回为0 ;因为你没有在整个信号中寻找索引而只是那个词。



所以在上面的代码中，只有前8个字符将是你设置的颜色，但是你想要的实际文字不会是彩色的。



你需要的是：

This will always return selectionSrart as 0; because you not looking for an index in the whole sentance instead just that word.

So in your code above, only the first 8 characters will be in the colour you set, but what you actual text you wanted wouldn''t be in colour.

What you need is:

int index = 0;
while (index != -1)
{
    // on the first round the index will be zero, thereafter the index will not be zero
    // therefore the index needs to be incremented by 1 from the last index so it can continue 
    // searching, otherwise the search will stuck to that same index.
    index = str.IndexOf(rtbInput.Text, (index != 0) ? (index + 1) : index );
    if ( index != -1)
    {
        rtbInput.SelectionStart = index;
        rtbInput.SelectionLength = ("football").Length;
        rtbInput.SelectionColor = Color.Red;
    }
}

我希望这会有所帮助。



问候

Jegan

I hope this helps.

Regards
Jegan

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