C#表达式类方法扩展,使字符串比较不区分大小写

这是我的表达式扩展方法 InBetweenStr 功能到 Expression ( System.Linq.Expressions.Expression )类别。然而,我想暗示字符串比较忽略大小写,所以我修改了 StringComparisonExpression 并添加了第三个参数: StringComparison.CurrentCultureIgnoreCase . 但代码当然不起作用,并抛出一个异常,表示:“为方法调用提供的参数数量不正确 Int32 Compare(System.String, System.String, System.StringComparison) ".

所以我想知道除了传递之外,还有没有一种优雅的方法可以使字符串比较不区分大小写 字符串比较。当前文化识别酶 作为第三个参数 string.Compare 从…起 Expression.Call

代码:

// for InBetweenStr and NotInBetweenStr
public static Expression<Func<int>> StringComparisonExpression = () => string.Compare(null, null);
public static MethodInfo StringComparisonExpressionhMethodInfo = ((MethodCallExpression) StringComparisonExpression.Body).Method;


public static Expression InBetweenStr(this Expression value, Expression lowerBound, Expression upperBound)
{
    // zero constant expression
    var zeroExpr = Expression.Constant(0);

    return Expression.AndAlso(
        Expression.GreaterThanOrEqual(Expression.Call(StringComparisonExpressionhMethodInfo, value, lowerBound), zeroExpr),
        Expression.LessThanOrEqual(Expression.Call(StringComparisonExpressionhMethodInfo, value, upperBound), zeroExpr)
    );
}

被改进的 StringComparisonExpression字符串比较 导致异常:

public static Expression<Func<int>> StringComparisonExpression = () => string.Compare(null, null, StringComparison.CurrentCultureIgnoreCase);