C # Null Value

Source: Internet
Author: User

1. null indicates that no null reference value of any object is referenced. Only referenced variables can be null. For example, int I = NULL is not allowed because int is a value type.

2. "And string. Empty both indicate empty strings. String. Empty does not allocate a bucket, "" allocates a bucket with an empty length. Therefore, the string. empty,

For the sake of future cross-platform use string. Empty

Note:

1. the difference between "" and null. "" Is an empty string, which is a special string, but the value of this string is null and has an accurate point in memory,

String str2 = NULL. After this definition, only a string class reference is defined. str2 does not point to any place.

2. String. isnullorempty (PARAM) checks whether it is null or null.

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