[英]How to get numbers from string in C#?
string str="this image has the width of 200px and height of 100px.";
int width, height;
How can I code to get 我怎样才能获得代码
width= 200;
height=100;
If width is more than 150, i will reduce the width to 150 and i will calculate the height 如果宽度超过150,我将宽度减小到150,我将计算高度
if(width>150)
{
height=(height*150)/200;
width=150;
}
And the result string would be.. 结果字符串将是..
str="this image has the width of 150px and height of 75px.";
I know substring() indexOf() split()
我知道substring() indexOf() split()
I know i can split the string with "width" but I dunno how to find the number of that splitted string. 我知道我可以用“宽度”分割字符串,但我不知道如何找到分割字符串的数量。
You can do it like this: 你可以这样做:
string str = "this image has the width of 200px and height of 100px.";
string[] numbers = Regex.Split(str, @"\D+");
// let's say 100x100 is default, so if TryParse fails you get 100x100
int width = 100;
int height = 100;
if (numbers.Length > 1)
{
Int32.TryParse(numbers[0], out width);
Int32.TryParse(numbers[1], out height);
}
You can do a regular expression match and save 200 + 100. 您可以进行正则表达式匹配并保存200 + 100。
Dim match As System.Text.RegularExpressions.Match = System.Text.RegularExpressions.Regex.Match(str, "this image has the width of (\d+)px and height of (\d+)px.")
Afterwards, look the values up in: 然后,查看以下值:
match.Groups(0).Value
match.Groups(1).Value
For C# it's 对于C#来说
match.Groups[0].Value;
match.Groups[1].Value;
int.Parse (string) or int.TryParse (string, out int) are probably the methods you want to use to convert a string to an int. int.Parse(string)或int.TryParse(string,out int)可能是您要用于将字符串转换为int的方法。
For example: 例如:
int width;
if (int.TryParse (widthString, out width) == true)
{
Console.WriteLine ("The width is {0}", width);
}
else
{
Console.WriteLine ("{0} could not be converted to an int.", widthString);
}
If the format of the string is always like that it becomes a rather trivial task. 如果字符串的格式总是那样,那么它就变成了一项相当简单的任务。 You basically just have to split the string with " " as the separator, and get the strings from the resulting array at position 6 and 10. Then just subtract the last 2 characters "px" and TryParse to int. 你基本上只需要用“”分隔字符串作为分隔符,并从位置6和10的结果数组中获取字符串。然后只需将最后2个字符“px”和TryParse减去int。 You have it. 你拥有了它。 Or just use some fancy Regex, like others will surely suggest. 或者只是使用一些花哨的正则表达式,就像其他人肯定会建议的那样。
There's a few parts to this. 这有几个部分。 First I would suggest a regular expression to match part of the string and explicitly capture the numeric parts of it. 首先,我建议使用正则表达式来匹配字符串的一部分,并明确地捕获它的数字部分。
eg, a possible regular expression could be: 例如,可能的正则表达式可能是:
width\sof\s(?<width>\d+)px\sand\sheight\sof\s(?<height>\d+)px
Which matches "width of XXXpx and height of YYYpx" where XXX is captured as a named group width
and YYY is captured as a named group height
. 其中“XXXpx的宽度和YYYpx的高度”匹配,其中XXX被捕获为命名组width
,YYY被捕获为命名组height
。
Here's the code so far: 这是迄今为止的代码:
string str="this image has the width of 200px and height of 100px.";
var regex = new Regex(@"width\sof\s(?<width>\d+)px\sand\sheight\sof\s(?<height>\d+)px");
var match = regex.Match(str);
Now that match
has 2 groups named width
and height
as previously described. 现在,该match
有2个组,如前所述,名称为width
和height
。 Then you use can use int.Parse
on the capture groups to get the values as numbers: 然后使用可以在捕获组上使用int.Parse
来获取值作为数字:
var width = int.Parse(match.Groups["width"].Value);
var height = int.Parse(match.Groups["height"].Value);
The last part, changing the number and re-formulating the string you seem to have a good grasp of, so I havent included that. 最后一部分,改变数字并重新制定你似乎很好掌握的字符串,所以我没有把它包括在内。
Here's a live example to demonstrate all of the above: http://rextester.com/rundotnet?code=CLPS3633 以下是演示以上所有内容的实例: http : //rextester.com/rundotnet?code = CLPS3633
Use Regex,Matches method 使用正则表达式,匹配方法
string str = "this image has the width of 200px and height of 100px.";
var numbers = Regex.Matches(str,@"\d+");
int no1, no2;
if (numbers.Count == 2)
{
int.TryParse(numbers[0].Value, out no1);
int.TryParse(numbers[1].Value, out no2);
}
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