Question

我有string，可以是“0”或“1”，并保证它不会是其他任何内容。

所以问题是：将此转换为bool的最佳，最简单和最优雅的方式是什么？

感谢。

Answer 1

确实很简单：

bool b = str == "1";

Answer 2

忽略这个问题的特定需求，虽然将字符串强制转换为bool永远不是一个好主意，但一种方法是在Convert类上使用ToBoolean()方法：

bool val = Convert.ToBoolean("true");

或一种扩展方法来做你正在做的任何奇怪的映射：

public static class StringExtensions
{
    public static bool ToBoolean(this string value)
    {
        switch (value.ToLower())
        {
            case  "true":
                return true;
            case "t":
                return true;
            case "1":
                return true;
            case "0":
                return false;
            case "false":
                return false;
            case "f":
                return false;
            default:
                throw new InvalidCastException("You can't cast that value to a bool!");
        }
    }
}

Answer 3

我知道这并不能回答你的问题，只是为了帮助其他人。如果你想转换＆＃34; true＆＃34;或＆＃34;假＆＃34;字符串到布尔值：

尝试使用Boolean.Parse

[{"record":
{"ID":"231",
"PARENT_RECORD_ID":"0",
"PARENT_PAGE_ID":"0",
"PARENT_ELEMENT_ID":"0",
"CREATED_DATE":"2015-05-01 10:57:36",
"CREATED_BY":"xxx@gmail.com",
"CREATED_LOCATION":"50.913196:-1.404536:0.000000:0.500000:0.500000:0.000000:0.000000:1430492800.000000",
"CREATED_DEVICE_ID":"207974019024161",
"MODIFIED_DATE":"2015-05-01 10:57:36",
"MODIFIED_BY":"xxx@gmail.com",
"MODIFIED_LOCATION":"50.913196:-1.404536:0.000000:0.500000:0.500000:0.000000:0.000000:1430492800.000000",
"MODIFIED_DEVICE_ID":"207974019024161",
"SERVER_MODIFIED_DATE":"2015-05-01 10:57:43",
"test":"Stack Overflow",
"my_element1":null},
"location":{"type":"point","coordinate":[50.913196,-1.404536]}}]

Answer 4

bool b = str.Equals("1")? true : false;

甚至更好，正如以下评论所示：

bool b = str.Equals("1");

Answer 5

我做了一些更具伸缩性的东西，捎带Mohammad Sepahvand的概念：

    public static bool ToBoolean(this string s)
    {
        string[] trueStrings = { "1", "y" , "yes" , "true" };
        string[] falseStrings = { "0", "n", "no", "false" };


        if (trueStrings.Contains(s, StringComparer.OrdinalIgnoreCase))
            return true;
        if (falseStrings.Contains(s, StringComparer.OrdinalIgnoreCase))
            return false;

        throw new InvalidCastException("only the following are supported for converting strings to boolean: " 
            + string.Join(",", trueStrings)
            + " and "
            + string.Join(",", falseStrings));
    }

Answer 6

我使用下面的代码将字符串转换为boolean。

Convert.ToBoolean(Convert.ToInt32(myString));

Answer 7

这是我尝试最宽容的字符串到布尔转换仍然有用，基本上只键入第一个字符。

public static class StringHelpers
{
    /// <summary>
    /// Convert string to boolean, in a forgiving way.
    /// </summary>
    /// <param name="stringVal">String that should either be "True", "False", "Yes", "No", "T", "F", "Y", "N", "1", "0"</param>
    /// <returns>If the trimmed string is any of the legal values that can be construed as "true", it returns true; False otherwise;</returns>
    public static bool ToBoolFuzzy(this string stringVal)
    {
        string normalizedString = (stringVal?.Trim() ?? "false").ToLowerInvariant();
        bool result = (normalizedString.StartsWith("y") 
            || normalizedString.StartsWith("t")
            || normalizedString.StartsWith("1"));
        return result;
    }
}

Answer 8

    private static readonly ICollection<string> PositiveList = new Collection<string> { "Y", "Yes", "T", "True", "1", "OK" };

public static bool ToBoolean(this string input)
{
                return input != null && PositiveList.Any(λ => λ.Equals(input, StringComparison.OrdinalIgnoreCase));
}

Answer 9

我喜欢扩展方法，这是我使用的方法......

static class StringHelpers
{
    public static bool ToBoolean(this String input, out bool output)
    {
        //Set the default return value
        output = false;

        //Account for a string that does not need to be processed
        if (input == null || input.Length < 1)
            return false;

        if ((input.Trim().ToLower() == "true") || (input.Trim() == "1"))
            output = true;
        else if ((input.Trim().ToLower() == "false") || (input.Trim() == "0"))
            output = false;
        else
            return false;

        //Return success
        return true;
    }
}

然后使用它就像做......

bool b;
bool myValue;
data = "1";
if (!data.ToBoolean(out b))
  throw new InvalidCastException("Could not cast to bool value from data '" + data + "'.");
else
  myValue = b;  //myValue is True

Answer 10

我用这个：

public static bool ToBoolean(this string input)
        {
            //Account for a string that does not need to be processed
            if (string.IsNullOrEmpty(input))
                return false;

            return (input.Trim().ToLower() == "true") || (input.Trim() == "1");
        }

Answer 11

string sample = "";

bool myBool = Convert.ToBoolean(sample);

Answer 12

如果您要测试字符串是否是没有任何抛出异常的有效布尔值，可以尝试以下方法：

    string stringToBool1 = "true";
    string stringToBool2 = "1";
    bool value1;
    if(bool.TryParse(stringToBool1, out value1))
    {
        MessageBox.Show(stringToBool1 + " is Boolean");
    }
    else
    {
        MessageBox.Show(stringToBool1 + " is not Boolean");
    }

输出is Boolean 并且stringToBool2的输出为：“不是布尔值”

如何将字符串转换为bool

12 个答案: