convert int to nullable int?

Question

I need to know how to convert an int to a nullable int. However, I keep getting an error \"The binary operator Equal is not defined for the types \'System.Nullable`1[System.

Answer 1

Here you go. A generic string to nullable primitive solution.

int? n = "  99 ".ToNullable(); 

/// 

/// Developed by Taylor Love
/// 
public static class ToNullableStringExtension
{
    /// 

    /// More convenient than using T.TryParse(string, out T). 
    /// Works with primitive types, structs, and enums.
    /// Tries to parse the string to an instance of the type specified.
    /// If the input cannot be parsed, null will be returned.
    /// 
    /// 
    /// If the value of the caller is null, null will be returned.
    /// So if you have "string s = null;" and then you try "s.ToNullable...",
    /// null will be returned. No null exception will be thrown. 
    /// 
    /// 
    /// 
    /// 
    /// 
    public static T? ToNullable(this string p_self) where T : struct
    {
        if (!string.IsNullOrEmpty(p_self))
        {
            var converter = System.ComponentModel.TypeDescriptor.GetConverter(typeof(T));
            if (converter.IsValid(p_self)) return (T)converter.ConvertFromString(p_self);
            if (typeof(T).IsEnum) { T t; if (Enum.TryParse(p_self, out t)) return t;}
        }

        return null;
    }

https://github.com/Pangamma/PangammaUtilities-CSharp/tree/master/src/StringExtensions