C＃创建所有可能的组合的字符串 [英] C# Create strings with all possible combinations

问题描述

所以我有一个接受一个字符串的方法。该字符串是从一个恒定值和2的bool，2常整型，和int，可以是10,20或30这都将是其中的参数用下划线分隔字符串建立起来了。

So I have a method which takes a string. The string is built up from a constant value and 2 bools, 2 constant ints, and an int that can be 10,20 or 30. this will all be a string where the parameters are seperated by underscore.

例如：

string value = "horse"
string combination1 = value+"_true_false_1_1_20";
dostuff(combination1);

我需要通过

I need to run every single possible combination through

我要如何利用这个恒定值，并通过该方法运行它与所有可能的组合

How do I take this constant value and run it through the method with all of the possible combinations ?

字符串建：VALUE_BOOL1_BOOL2_CONSTINT1_CONSTINT2_INT1

String built: "VALUE_BOOL1_BOOL2_CONSTINT1_CONSTINT2_INT1"

Possibilities
    VALUE = Horse
    BOOL1 = True, False
    BOOL2 = True, False
    CONSTINT1 = 1
    CONSTINT2 = 1,
    INT1 = 10, 20, 30

如何我可以把预定义的字符串值，并创造一切可能的组合，并通过doStuff（字符串组合）方式运行呢？

How can I take the predefined value string and create all possible combinations and run them through the doStuff(string combination) method ?

推荐答案

您可以用一个非常可读的LINQ语句来做到这一点没有使用循环：

You can do this with a very readable LINQ statement without the use of loops:

public static List<String> Combis(string value)
{   
  var combis =
    from bool1 in new bool[] {true, false}
    from bool2 in new bool[] {true, false}
    let i1 = 1
    let i2 = 1
    from i3 in new int[] {10, 20, 30}
    select value + "_" + bool1 + "_" + bool2 + "_" + i1 + "_" + i2 + "_" + i3;

  return combis.ToList();
}

---

编辑：记住该多个阵列已经在上述溶液中创建，因为中子句被评为多次的。你可以将其更改为以下来规避这样的：

---

Keep in mind that multiple arrays have to be created in the above solution because the in-clause is evaluated multiple times. You could change it to the following to circumvent this:

public static List<String> Combis(string value)
{
    bool[] bools = new[] {true, false};
    int[] ints = new[] {10, 20, 30};

    var combis =
        from bool1 in bools
        from bool2 in bools
        let i1 = 1
        let i2 = 1
        from i3 in ints
        select value + "_" + bool1 + "_" + bool2 + "_" + i1 + "_" + i2 + "_" + i3;

    return combis.ToList();
}

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