运行时报错：“找不到Int32 System.String.Compare。。。。。” 求指教

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运行时报错：“找不到Int32 System.String.Compare(System.String,System.String,System.Globalization.CultureInfo,System.Globalization.CompareOptions)”。
引用中添加了"System"。
但其实这个函数是micorlib.dll中的system的，而引用中无法添加这个文件，此项目系统自动引用。
查看此文件，确实没有这个Compare函数。但是另一台机子中也没有这个函数，但能正常运行。。。。。。
很奇怪，原来没问题，突然产生了这个问题。

求指教

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mscorlib，打错了

[qiume]

多个版本的.net framework......

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[Quote=引用 2 楼 qiume 的回复:]

多个版本的.net framework......
[/Quote]

问题是早上9点能用的，后来我修改了下程序，就不能用了。不知道是哪里改动了。。。。。悲催

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自己顶起啊

[asthegarn]

卸掉你新安装的软件，试试看~我以前也遇到过

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竟然真的是这样的。。。。

[Quote=引用 5 楼 asthegarn 的回复:]

卸掉你新安装的软件，试试看~我以前也遇到过
[/Quote]

[IE11下面经常卡到爆]

有这两个

//
        // Summary:
        //     Compares two specified System.String objects using the specified comparison
        //     options and culture-specific information to influence the comparison, and
        //     returns an integer that indicates the relationship of the two strings to
        //     each other in the sort order.
        //
        // Parameters:
        //   strA:
        //     The first string.
        //
        //   strB:
        //     The second string.
        //
        //   culture:
        //     The culture that supplies culture-specific comparison information.
        //
        //   options:
        //     Options to use when performing the comparison (such as ignoring case or symbols).
        //
        // Returns:
        //     A 32-bit signed integer that indicates the lexical relationship between strA
        //     and strB, as shown in the following table Value Condition Less than zero
        //     strA is less than strB.  Zero strA equals strB.  Greater than zero strA is
        //     greater than strB.
        //
        // Exceptions:
        //   System.ArgumentException:
        //     options is not a System.Globalization.CompareOptions value.
        //
        //   System.ArgumentNullException:
        //     culture is null.
        public static int Compare(string strA, string strB, CultureInfo culture, CompareOptions options);

//
        // Summary:
        //     Compares substrings of two specified System.String objects using the specified
        //     comparison options and culture-specific information to influence the comparison,
        //     and returns an integer that indicates the relationship of the two substrings
        //     to each other in the sort order.
        //
        // Parameters:
        //   strA:
        //     The first string.
        //
        //   indexA:
        //     The starting position of the substring within strA.
        //
        //   strB:
        //     The second string.
        //
        //   indexB:
        //     The starting position of the substring within strB.
        //
        //   length:
        //     The maximum number of characters in the substrings to compare.
        //
        //   culture:
        //     The culture that supplies culture-specific comparison information.
        //
        //   options:
        //     Options to use when performing the comparison (such as ignoring case or symbols).
        //
        // Returns:
        //     An integer that indicates the lexical relationship between the two substrings,
        //     as shown in the following table.  Value Condition Less than zero The substring
        //     in strA is less than the substring in strB.  Zero The substrings are equal
        //     or length is zero.  Greater than zero The substring in strA is greater than
        //     the substring in strB.
        //
        // Exceptions:
        //   System.ArgumentException:
        //     options is not a System.Globalization.CompareOptions value.
        //
        //   System.ArgumentOutOfRangeException:
        //     indexA is greater than strA.Length.  -or- indexB is greater than strB.Length.
        //      -or- indexA, indexB, or length is negative.  -or- Either strA or strB is
        //     null, and length is greater than zero.
        //
        //   System.ArgumentNullException:
        //     culture is null.
        public static int Compare(string strA, int indexA, string strB, int indexB, int length, CultureInfo culture, CompareOptions options);