Because <null>there is no implicit conversion between and System.DateTime

Little scum · Posted on 11/3/2015 4:13:48 PM

The type of conditional expression cannot be determined because there <null>is no implicit conversion between "" and "System.DateTime" ---- workaround

When using nullable types in C#, pay attention to the consistency between types, and the above problem of not being able to convert with DateTime is that you do not pay attention to the consistency between types, for example, when assigning a value to a nullable time type field, you cannot use null, but you want to use a DateTime? Type.

Example: (Error)

public DateTime? time { get; set; }

time = item. HospOutDate.HasValue ? DateTime.Parse(item. HospOutDate.Value.ToString("yyyy-MM-dd HH:mm:ss")) : null;

Error message: The type of conditional expression cannot be determined because there <null>is no implicit conversion between "" and "System.DateTime"

Solution:

Added: DateTime? TimeNull = null;

time = item. HospOutDate.HasValue ? DateTime.Parse(item. HospOutDate.Value.ToString("yyyy-MM-dd HH:mm:ss")) : TimeNull ;

Solution:

Declared DateTime before? TimeNull = null;
Then site. UpdateTime = dr["UpdateTime"]. ToString(). Equals("") ? TimeNull : Convert.ToDateTime(dr["UpdateTime"]);

[Source] Because <null>there is no implicit conversion between and System.DateTime

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