将字符串数组转换为int列表

问题描述：

我的代码是

my code is

string tabtype = "5,7,11";
string[] strTabTypes = tabtype.Split(',');
List<int> lstInt = new List<int>();

for (int i = 0; i < strTabTypes.Length; i++)
  lstInt.Add(Convert.ToInt32(strTabTypes[i]));

将字符串转换为int时出错

如何解决

getting error when converting string to int

how to solve it

答

这几乎肯定是一个数据问题，因为tabtype的内容不是你所期望的。

所以试试这个：

It's almost certainly a data problem, in that the contents of tabtype are not what you expected.
So try this:

string[] strTabTypes = tabtype.Split(',');
List<int> lstInt = new List<int>();

for (int i = 0; i < strTabTypes.Length; i++)
   {
   try
      {
      lstInt.Add(Convert.ToInt32(strTabTypes[i]));
      }
   catch(Exception ex)
      {
      Console.WriteLine("Problem converting input {0} : \"{1}\" to an integer:\n{2}", i, strTabTypes[i], ex.Message);
      }
   }

它至少会告诉你问题是什么。

It will at least tell you what the problem is.

// using Linq; // required

string[] strTabTypes = tabtype.Split(',');

List<int> lstInt = strTabTypes.Select(str => Convert.ToInt32(str)).ToList();

请注意，此方法将用于如果'strTabTypes数组中的任何字符串对转换为Int32无效，则抛出System.FormatException错误。

这是一种可以进行错误检查的方法使用Linq进行转换：

Note that this approach is going to throw a System.FormatException error if any of the strings in the 'strTabTypes array are not valid for conversion to Int32.

Here's one way you could approach error-checking in the conversion using Linq:

Int32 testInt;

List<int> lstIn2 = strTabTypes
    .Select(str => Int32.TryParse(str, out testInt) ? testInt : Int32.MaxValue)
    .ToList();

在这个例子中，如果有任何字符串无法转换为Int32，则返回Int32.MaxValue：2,147,483,647：十六进制0x7FFFFFFF。

但是，也许正确的做法是将转换放在Try / Catch块中并处理错误，或者重新抛出错误？

In this example, if there is any string that can't be converted to Int32, then Int32.MaxValue is returned: 2,147,483,647 : hexadecimal 0x7FFFFFFF.

But, perhaps the right thing for you to do is put the conversion in a Try/Catch block and handle the error, or re-throw the error ?

下面的代码提供了更强大的解决方案与原始解决方案相比。

The code below provides for a more robust solution compared to your original solution.

string tabtype = "1,5,11"; // Just an example

// This way you make sure that there are no empty positions in the string array
string[] strTabTypes = tabtype.Split(new char[] { ',' },
                                      StringSplitOptions.RemoveEmptyEntries);
List<int> lstInt = new List<int>();

foreach (string s in strTabTypes)           // foreach is easier to use in this case
    lstInt.Add(Convert.ToInt32(s.Trim()));  // Removes head and tail spaces

您当然可以根据解决方案1添加错误检查。

You can of course add an error check according to solution 1.

将字符串数组转换为int列表

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