According to MSDN there is an overload of GetFactory(DbConnection) in .NET 4. However, I can't invoke it - fails at compile time saying:
error BC30518: Overload resolution failed because no accessible 'GetFactory' can be called with these arguments:
'Public Shared Function GetFactory(providerRow As System.Data.DataRow) As System.Data.Common.DbProviderFactory': Value of type 'System.Data.Common.DbConnection' cannot be converted to 'System.Data.DataRow'.
'Public Shared Function GetFactory(providerInvariantName As String) As System.Data.Common.DbProviderFactory': Value of type 'System.Data.Common.DbConnection' cannot be converted to 'String'.
Is there something wrong with my .NET FW or is it a typo in documentation?
You can call the "GetFactory" method using the following solution:
https://msdn.microsoft.com/en-us/library/dd0w4a2z%28v=vs.110%29.aspx
DbProviderFactory factory =
DbProviderFactories.GetFactory(providerName);
Related
I am using contains method for a string in dart but getting an error like this.
can anyone tell me what is wrong with using .contains for a string in dart
This is my code
String isPdf = "https://www.africau.edu/images/default/sample.pdf";
isPdf.contains("pdf");
Error occurs
The method 'contains' isn't defined for the type 'String'.
Try correcting the name to the name of an existing method, or defining a method named 'contains'.
In vscode quickfix tells me that
change the 'contains' method to 'oscontains'.
I can do this and I don't have any issues:
class MyClass:
def introduce(self):
print("Hello, I am %s, and my name is " %(self))
MyClass.introduce(0)
MyClass().introduce()
I'm using Visual Studio and Python 3.4.1. I don't understand why this doesn't throw an error since I'm basically setting the value of this. Is this a feature and I just shouldn't be doing this? Should I be checking if self is actually an instance of MyClass?
In Python 3 when you do MyClass.introduce() introduce is not linked to any object. It's considered as a (standalone) function like any other function you would declare by itself. The fact that it is declared within a class is not relevant here. introduce is therefore called like any function: a function with one parameter.
When you do MyClass().introduce() (notice the first set of parentheses) introduce is considered as a method belonging to an object which is an instance of class MyClass hence the regular OO behavior of adding automatically the self parameter.
Note that this is different for python 2. In python 2 there is a check to verify that when called, the effective argument passed for the self parameter is indeed an object of the correct type, i.e. an instance of MyClass. If you try MyClass.introduce(0) in Python 2 you'll get: unbound method introduce() must be called with MyClass instance as first argument (got int instance instead). This check doesn't exist in Python 3 anymore because the notion of unbound method no longer exist.
list.add(build.equal(bondRoot.get(Bond_.writingCompanyCode),dtlRoot.get(ArPstdDtl_.companycd ).as(String.class)));
but am getting the following error:
Caused by: org.apache.openjpa.persistence.ArgumentException: No metadata
was found for type "class java.lang.String". The class is not
enhanced.
Could someone help me out on this ??
Changing type from BigDecimal to String needs conversion, not a cast. Method as cannot convert from type to other - it is purely for typecasting, as documented:
Perform a typecast upon the expression, returning a new expression
object. This method does not cause type conversion: the runtime type
is not changed. Warning: may result in a runtime failure.
Criteria API does not offer conversion from BigDecimal to String. Database vendor specific functions can be used via CriteriaBuilder.function.
I have a case that is very similar to this, but following the advice in the answers does not solve my problem.
I have a ViewModel in an MVC 2 application that contains another class. I have a controller that contains a strongly typed create method:
[Authorize]
[HttpPost]
public ActionResult Create(AIViewModel ai)
{
}
When I look at the ModelState when I enter the Create method, the data indicates that the simple properties that are present within the AIViewModel class are bound correctly, while the complex type that is in there fails with the following error message:
"The parameter conversion from type 'System.String' to type 'xyz' failed because no type converter can convert between these types."
If I look at the value that it tries to bind, it has indeed the System.String type and value "Create". Anybody has a clue on what I could be doing wrong?
UPDATE: I have found the problem: The property is called Action, which somehow fools the the modelbinder. Renaming the property solved the issue.
In RhinoMocks, there's Stub extension method, that takes Action<T>. For some reason this:
CurrentInvoice.Stub(i => i.TaxYear).Return(1);
works great, but this:
CurrentInvoice.Stub(new Action<Invoice>(i => i.TaxYear)).Return(1);
produces the compiler error:
Only assignment, call, increment, decrement, and new object expressions can be used as a statement
The intellisense for this method explicitly says that it expects Action<Invoice>, so I can't understand why the first works, but not the second.
The main relevance of this is that I'd like to be able to pass some of these configuration lambdas as parameters to a method, and I run into this same issue.
Thanks
Are you sure you're not accidentally using an overload for Stub which takes a Func<T, TResult> in the first line? I can't see why the first call would work otherwise.
Do you have a link to API documentation?