将字符串转换为 int 并在 C# 中测试成功
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Convert string to int and test success in C#
提问by TheFlash
How can you check whether a stringis convertibleto an int?
如何检查字符串是否可以转换为int？
Let's say we have data like "House", "50", "Dog", "45.99", I want to know whether I should just use the stringor use the parsed intvalue instead.
假设我们有像“House”、“50”、“Dog”、“45.99”这样的数据，我想知道我是应该使用字符串还是使用解析的int值。
In JavaScript we had this parseInt()function. If the string couldn't be parsed, it would get back NaN.
在 JavaScript 中，我们有这个parseInt()函数。如果无法解析字符串，它将返回NaN。
采纳答案by Johnno Nolan
Int32.TryParse(String, Int32)- http://msdn.microsoft.com/en-us/library/f02979c7.aspx
Int32.TryParse(String, Int32)- http://msdn.microsoft.com/en-us/library/f02979c7.aspx
bool result = Int32.TryParse(value, out number);
if (result)
{
Console.WriteLine("Converted '{0}' to {1}.", value, number);
}
回答by keithwarren7
Int.TryParse
Int.TryParse
回答by BenAlabaster
Could you not make it a little more elegant by running the tryparse right into the if?
通过将 tryparse 直接运行到 if 中，您能不能让它更优雅一点？
Like so:
像这样：
if (Int32.TryParse(value, out number))
Console.WriteLine("Converted '{0}' to {1}.", value, number);
回答by Ganesh Kamath - 'Code Frenzy'
found this in one of the search results: How do I identify if a string is a number?
在其中一个搜索结果中找到了这个：How do I identify a string is a number?
Adding this because the answers i saw before did not have usage:
添加这个是因为我之前看到的答案没有使用：
int n;
bool isNumeric = int.TryParse("123", out n);
here "123"can be something like string s = "123"that the OP is testing and the value nwill have a value (123) after the call if it is found to be numeric.
这里"123"可以是类似于s = "123"OP 正在测试的字符串的东西，如果发现它是数字，则该值n将123在调用后具有一个值 ( )。
