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String

DefaultIfEmpty

Return default value if current string is empty, equals null or equals white space, otherwise current string.
var result = " ".DefaultIfEmpty("defaultValue"); // defaultValue
var result = "someValue".DefaultIfEmpty("defaultValue"); // someValue

Cast

Casts string to specified type or throws if cast is impossible and throwIfInvalidCast set to true.
var result = "123,45".Cast(typeof(float?), true); // 123.45F
var result = "123,45abc".Cast(typeof(float?), true); // throws InvalidCastException
var result = "123,45abc".Cast(typeof(float?), false); // null
private enum FooBarBaz
{
Foo,
Bar,
Baz
}
var result = "Bar".Cast(typeof(FooBarBaz?), false); // FooBarBaz.Bar

ToHyphenCase

Formats string value into hyphen case format. For example "ToHyphenCase" will be formated into "to-hyphen-case".
var result = "ToHyphenCase".ToHyphenCase() // to-hyphen-case

ToCamelCase

Formats string value into camel case format. For example "ToCamelCase" will be formated into "toCamelCase".
var result = "ToCamelCase".ToCamelCase() // toCamelCase

ToSnakeCase

Formats string value into snake case format. For example "ToSnakeCase" will be formated into "to_snake_case".
var result = "ToSnakeCase".ToSnakeCase() // to_snake_case

Contains

Returns a value indicating whether a specified string occurs within this string, using the specified comparison rules. Method could be useful to projects prior to .net standard 2.1. Similar method added to string in .net standard 2.1.
var result = "QwErTy".Contains("wert", StringComparison.Ordinal) // false
var result = "QwErTy".Contains("wert", StringComparison.OrdinalIgnoreCase) // true

Replace

Returns a new string in which all occurrences of a specified string in the current instance are replaced with another specified string using provided comparison rule. Method could be useful to projects prior to .net standard 2.1. Similar method added to string in .net standard 2.1.
var result = "QwErTyQwErTy".Replace("WeR", "123", StringComparison.Ordinal) // QwErTyQwErTy
var result = "QwErTyQwErTy".Replace("WeR", "123", StringComparison.OrdinalIgnoreCase) // Q123TyQ123Ty
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DefaultIfEmpty
Cast
ToHyphenCase
ToCamelCase
ToSnakeCase
Contains
Replace