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Expression instead of statement


Expression instead of statement

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Expression instead of statement
Tag : chash , By : Crilledk
Date : September 15 2020, 04:00 AM

I wish this help you Updated to answer your updated question and use the ??= operator:
If setObj returns the object then:
x ??= setObj(obj).x
x ??= (setObj(obj) is var _ ? obj.x : 0);
x ??= new Func<MyStruct>(() => { setObj(obj); return obj; })().x;
MyStruct obj;
int? x = null;
x ??= (obj = getObj()).x

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Statement requires expression of integer type (int invalid) error with switch statement


Tag : ios , By : n1ckless_id
Date : March 29 2020, 07:55 AM
Hope that helps I am trying to load an image and label corresponding to the table view row/cell selected by the user. The code appears in my DetailViewController implementation file as follows: , Make the data type of characterNumber as int.

A lambda expression with a statement body cannot be converted to an expression tree


Tag : chash , By : Cowtung
Date : March 29 2020, 07:55 AM
this one helps. Expression trees were originally created for LINQ, which is about queries. Queries are generally function-based, so single-expression lambdas fit really well, without needing to worry about control flow within the expression tree etc. I suspect that translating expression trees for arbitrary statement lambdas into SQL etc would be a fool's errand.
Expression trees were later enhanced for .NET 4 (largely for the sake of the DLR, I believe) but the C# 4 compiler doesn't actually need to create complicated expression trees from lambda expressions for that - so it's mostly that there just isn't enough benefit for it to be worth it.

A lambda expression with a statement body cannot be converted to an expression tree in nopCommerce


Tag : chash , By : user160048
Date : March 29 2020, 07:55 AM
it helps some times The error message is exactly what it says. You have a lambda expression. It has a statement body. A lambda expression with a statement body can not be converted to an expression tree. But Join requires an expression tree to use with EF. You should try replacing what you have with a lambda expression that doesn't have a body like:
(cev, c) => new CustomerEventRolesModel {
                Id = cev.Id,
                CustomerId = c.Id
            }
ContactName = c.GetAttribute<string>(SystemCustomerAttributeNames.FirstName)

How to fix "A lambda expression with a statement body cannot be converted to an expression tree” for sql for execut


Tag : chash , By : kuba53280
Date : March 29 2020, 07:55 AM
I wish this helpful for you Looks like the switch statement has no SQL equivelant and it's expecting to run this in Linq to Objects.
It appears that a conditional operator has a direct conversion: https://www.codeproject.com/Articles/38264/How-to-Create-T-SQL-CASE-Statements-With-LINQ-To-S

How can I force a throw to be a statement and not an expression (in a lambda expression)?


Tag : chash , By : Kenny
Date : March 29 2020, 07:55 AM
it should still fix some issue You could add a cast to for Action, although it does get a bit LISP'y with all the parentheses:
M((Action)(() => throw new Exception()));
Action thrw = () => throw new Exception();
M(thrw);
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