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The cast to value type 'Int32' failed because the materialized value is null
...To allow a nullable Amount field, just use the null coalescing operator to convert nulls to 0.
var creditsSum = (from u in context.User
join ch in context.CreditHistory on u.ID equals ch.UserID
where u.ID == userID
se...
Python Unicode Encode Error
...bar” df' print u.encode('ascii', 'ignore') For you, it was probably converting your string INTO unicode given the encoding you specified for the python scrip that threw the error.
– Scott Stafford
Jul 11 '10 at 20:48
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How to check for a valid Base64 encoded string
... way in C# to see if a string is Base 64 encoded other than just trying to convert it and see if there is an error? I have code code like this:
...
How do I store an array in localStorage? [duplicate]
... @Howdy_McGee As localStorage only supports strings, arrays must be converted to a string format. The best way to do this is to convert it into a JSON array as it is easy to convert between the two states (JSON is just a long piece of string data). You may want to read up on JSON if that is w...
Test if executable exists in Python?
... set. I also find it useful to add this to the top of the function: import sys; if sys.platform == "win32" and not program.endswith(".exe"): program += ".exe". This way under Windows you can refer to either "calc" or "calc.exe", just like you could in a cmd window.
– Kevin Ivar...
json_decode to array
...e PHP Documentation json_decode function has a parameter named assoc which convert the returned objects into associative arrays
mixed json_decode ( string $json [, bool $assoc = FALSE ] )
Since assoc parameter is FALSE by default, You have to set this value to TRUE in order to retrieve an arra...
Why isn't the size of an array parameter the same as within main?
...
An array-type is implicitly converted into pointer type when you pass it in to a function.
So,
void PrintSize(int p_someArray[10]) {
printf("%zu\n", sizeof(p_someArray));
}
and
void PrintSize(int *p_someArray) {
printf("%zu\n", sizeof(p_som...
How to convert View Model into JSON object in ASP.NET MVC?
... 2-dimensional array to a 1-dimensional array in json. Newtonsoft.Json.JsonConvert.SerializeObject serializes the two dimensions properly into json. So I suggest to use the latter one.
– mono68
Feb 5 '15 at 17:39
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Convert to absolute value in Objective-C
How do I convert a negative number to an absolute value in Objective-C?
2 Answers
2
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How to check that a string is an int, but not a double, etc.?
PHP has an intval() function that will convert a string to an integer. However I want to check that the string is an integer beforehand, so that I can give a helpful error message to the user if it's wrong. PHP has is_int() , but that returns false for string like "2" .
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