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The cast to value type 'Int32' failed because the materialized value is null
...D == userID
select (int?)ch.Amount).Sum() ?? 0;
This first casts to int? to tell the C# compiler that this expression can indeed return null, even though Sum() returns an int. Then we use the normal ?? operator to handle the null case.
Based on this answer, I wrote a blog post with ...
How do I convert from int to Long in Java?
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Note that there is a difference between a cast to long and a cast to Long. If you cast to long (a primitive value) then it should be automatically boxed to a Long (the reference type that wraps it).
You could alternatively use new to create an instance of Long, init...
How to extract filename.tar.gz file
....tar.gz file to my machine from the web then uploaded it to the server via FTP. After that, the "tar" command worked as it was expected.
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Cast Int to enum in Java
What is the correct way to cast an Int to an enum in Java given the following enum?
17 Answers
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Convert a string to int using sql query
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You could use CAST or CONVERT:
SELECT CAST(MyVarcharCol AS INT) FROM Table
SELECT CONVERT(INT, MyVarcharCol) FROM Table
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Why can I type alias functions and use them without casting?
...hat clarifies the type lark a little for someone else! And means much less casting than I at first thought :)
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Test if object implements interface
... +1 The second one is better because you will probably end up needing to cast afterward with the first one thus giving you two casts ("is" and then an explicit cast). With the second approach you only cast once.
– Andrew Hare
Jan 4 '09 at 6:02
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How to print VARCHAR(MAX) using Print Statement?
... worked.
DECLARE @info NVARCHAR(MAX)
--SET @info to something big
PRINT CAST(@info AS NTEXT)
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How do I perform an insert and return inserted identity with Dapper?
...gle<int>( @"
INSERT INTO [MyTable] ([Stuff]) VALUES (@Stuff);
SELECT CAST(SCOPE_IDENTITY() as int)", new { Stuff = mystuff});
Note that on more recent versions of SQL Server you can use the OUTPUT clause:
var id = connection.QuerySingle<int>( @"
INSERT INTO [MyTable] ([Stuff])
OUTPUT ...
Read data from SqlDataReader
... col1Value = rdr[0].ToString();
These are objects, so you need to either cast them or .ToString().
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