文本框按字符数拆分文本

Question

我需要读取70个字符块并发送到终端模拟器。 我真的不确定如何在子串长度时这样做，不能在字符串中产生更大量的数据（microsoft生成错误）。 文本框中的最后一行始终小于70。

有谁知道更好的方法吗？

TextBox可以在打开自动换行功能时接受1000个字符。

int startIndex = 0;
int slength = 70;

for (int i = 0; i < body.Text.Length; i += 70)
{
    if(body.Text.Length < 70)
    {
        String substring1 = body.Text.Substring(startIndex, body.Text.Length);
        CoreHelper.Instance.SendHostCommand("¤:5H¤NCCRMKS / " + body.Text, UIHelper.Instance.CurrentTEControl, true, true);
    };

    if (body.Text.Length > 70)
    {
        String substring1 = body.Text.Substring(startIndex, slength);
        CoreHelper.Instance.SendHostCommand("¤:5H¤NCCRMKS / " + body.Text, UIHelper.Instance.CurrentTEControl, true, true);

    };
}

Answer 1

方法1 （传统子串） - 最快：

string str = "123456789";

int currentIndex = 0;
int pageSize = 7;
List<string> results = new List<string>();
while(true)
{
    int length = Math.Min(pageSize, str.Length - currentIndex);
    string subStr = str.Substring(currentIndex, length);
    results.Add(subStr);

    if (currentIndex + pageSize >= str.Length - 1)
        break;

    currentIndex += pageSize;
}

方法2 （Linq）：

Linq的Skip和Take的组合也可以解决问题。 这称为分页：

String str = "123456789";

int page = 0;
int pageSize = 7; // change this to 70 in your case
while(true)
{
    string subStr = new string(str.Skip(page * pageSize).Take(pageSize).ToArray());
    Console.WriteLine(subStr);


    page++;

    if (page * pageSize >= str.Length)
        break;
}

打印：

1234567
89

Answer 2

如果要在特定大小之前拆分单词，请使用此扩展名：

 /// <summary>Use this function like string.Split but instead of a character to split on, 
 /// use a maximum line width size. This is similar to a Word Wrap where no words will be split.</summary>
 /// Note if the a word is longer than the maxcharactes it will be trimmed from the start.
 /// <param name="initial">The string to parse.</param>
 /// <param name="MaxCharacters">The maximum size.</param>
 /// <remarks>This function will remove some white space at the end of a line, but allow for a blank line.</remarks>
 /// 
 /// <returns>An array of strings.</returns>
 public static List<string> SplitOn( this string initial, int MaxCharacters )
 {
    List<string> lines = new List<string>();

    if ( string.IsNullOrEmpty( initial ) == false )
    {
        string targetGroup = "Line";
        string pattern = string.Format( @"(?<{0}>.{{1,{1}}})(?:\W|$)", targetGroup, MaxCharacters );

        lines = Regex.Matches(initial, pattern, RegexOptions.Multiline | RegexOptions.CultureInvariant | RegexOptions.Compiled)
                     .OfType<Match>()
                     .Select(mt => mt.Groups[targetGroup].Value)
                     .ToList();
    }

    return lines;
 }

用法

var text = @"
The rain in spain
falls mainly on the
plain of Jabberwocky
falls.";

foreach ( string line in text.SplitOn( 11 ) )
    Console.WriteLine( line );

/* Result
The rain in
spain falls
mainly on
the plain
of
Jabberwocky
falls.
 */

---

这是我的博客文章C＃：String Extension SplitOn将文本拆分为特定尺寸«OmegaMan's Musings

Answer 3

此Substring重载接受起始索引和长度。 您正在传递body.Text.Length的长度为第二个（长度）参数，这可能是整个字符串的长度。 你应该传递body.Text.Length - startIndex 。