如何仅解析字符串中的数字? [英] How can i parse only the numbers from the string?
问题描述
我希望在transform属性下的Rect.rectangles中具有字符串"matrix(0.87142591,0.49052715，-0.49052715,0.87142591,0,0)"来具有2个属性，例如transform和transform1，并且每个属性都有一个数字例如:转换"0.12345678" transform1"1.12345678"
I want that in Rect.rectangles under the transform property instead to have the string "matrix(0.87142591,0.49052715,-0.49052715,0.87142591,0,0)" to have 2 properties like transform and transform1 and each one will have a number for example: transform "0.12345678" transform1 "1.12345678"
private void Parse()
{
XDocument document = XDocument.Load(@"C:\Users\mysvg\Documents\my.svg");
Rect.rectangles = document.Descendants().Where(x => x.Name.LocalName == "rect").Select(x => new Rect()
{
style = Rect.GetStyle((string)x.Attribute("style")),
id = (string)x.Attribute("id"),
width = (double)x.Attribute("width"),
height = (double)x.Attribute("width"),
x = (double?)x.Attribute("width"),
y = (double?)x.Attribute("width"),
transform = x.Attribute("transform".Substring(18, 43)) == null ? "" : (string)x.Attribute("transform".Substring(18, 43))
}).ToList();
}
和Rect类:
public class Rect
{
public static List<Rect> rectangles { get; set; }
public Dictionary<string, string> style { get; set; }
public string id { get; set; }
public double width { get; set; }
public double height { get; set; }
public double? x { get; set; }
public double? y { get; set; }
public string transform { get; set; }
public static Dictionary<string, string> GetStyle(string styles)
{
string pattern = @"(?'name'[^:]+):(?'value'.*)";
string[] splitArray = styles.Split(new char[] { ';' });
Dictionary<string, string> style = splitArray.Select(x => Regex.Match(x, pattern))
.GroupBy(x => x.Groups["name"].Value, y => y.Groups["value"].Value)
.ToDictionary(x => x.Key, y => y.FirstOrDefault());
return style;
}
}
我正在尝试使用子字符串，但超出范围异常.
I'm trying to use substring but getting out of range exception.
ArgumentOutOfRangeException:不能超过字符串的长度
ArgumentOutOfRangeException: Cannot exceed length of string
在线:
transform = x.Attribute("transform".Substring(18, 43)) == null ? "" : (string)x.Attribute("transform".Substring(18, 43))
字符串是:
transform ="matrix(0.40438612，-0.91458836,0.92071162,0.39024365,0,0)"
transform="matrix(0.40438612,-0.91458836,0.92071162,0.39024365,0,0)"
我只想获得前两个数字:0.40438612，-0.91458836
And i want to get only the first two numbers: 0.40438612,-0.91458836
更新:
我也找到了一种使用foreach的方法:
I found also a way to do it using foreach:
private void Parse()
{
XDocument document = XDocument.Load(@"C:\Users\mysvg\Documents\my.svg");
Rect.rectangles = document.Descendants().Where(x => x.Name.LocalName == "rect").Select(x => new Rect()
{
style = Rect.GetStyle((string)x.Attribute("style")),
id = (string)x.Attribute("id"),
width = (double)x.Attribute("width"),
height = (double)x.Attribute("width"),
x = (double?)x.Attribute("width"),
y = (double?)x.Attribute("width"),
transform = x.Attribute("transform") == null ? "" : (string)x.Attribute("transform")
}).ToList();
string t = null;
foreach(Rect rect in Rect.rectangles)
{
if (rect.transform != null && rect.transform != "")
{
t = rect.transform.Substring(7, 21);
}
}
}
但是我不想在新的Rect(){ 我想在行上提取前两个数字:
But i don't want to do it after the new Rect() { I want to do the first two numbers extraction on the line:
transform = x.Attribute("transform") == null ? "" : (string)x.Attribute("transform")
原因是我在代码底部有一个类:
The reason is that i have in the bottom of the code a class:
public class Rect
{
public static List<Rect> rectangles { get; set; }
public Dictionary<string, string> style { get; set; }
public string id { get; set; }
public double width { get; set; }
public double height { get; set; }
public double? x { get; set; }
public double? y { get; set; }
public string transform { get; set; }
public static Dictionary<string, string> GetStyle(string styles)
{
string pattern = @"(?'name'[^:]+):(?'value'.*)";
string[] splitArray = styles.Split(new char[] { ';' });
Dictionary<string, string> style = splitArray.Select(x => Regex.Match(x, pattern))
.GroupBy(x => x.Groups["name"].Value, y => y.Groups["value"].Value)
.ToDictionary(x => x.Key, y => y.FirstOrDefault());
return style;
}
}
而且我希望属性转换已包含/包含两个数字.
And i want that the property transform to hold/contain the two numbers already.
另一个小问题是，如果数字中的一个在开始时具有-(减号)，例如，如果transform包含字符串，该如何提取前两个数字:"matrix(0.40438612，-0.91458836,0.92071162,0.39024365， 0,0)"
And another small problem how can i extract the first two numbers if for example one of the numbers have -(minus) in the start for example if transform contain the string: "matrix(0.40438612,-0.91458836,0.92071162,0.39024365,0,0)"
如果两个数字之一以负号开头或两个都以负号开头，则Substring(7，21)将不起作用.无论如何，我都需要某种方式来获得前两个数字.但是主要的问题是如何直接从属性中直接提取数字.
If one of the two numbers have minus in the start or both of them have minus in the start the Substring(7, 21) will not work. I need somehow to get in any case the first two numbers. But the main issue is how to extract the numbers directly from the attribute already.
推荐答案
您是否正在寻找正则表达式?
using System.Globalization;
using System.Linq;
using System.Text.RegularExpressions;
...
string transform = "matrix(0.40438612,-0.91458836,0.92071162,0.39024365,0,0)";
double[] result = Regex
.Matches(transform, @"-?[0-9]*\.?[0-9]+")
.OfType<Match>()
.Take(2)
.Select(match => double.Parse(match.Value, CultureInfo.InvariantCulture))
.ToArray();
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