C#•2mo ago

✅ Better way to set a property using linq?

I have this on a blazor component:

 ValueChanged=@( async text => {
            protocol.maxIterations = text;
            await OnProtocolChanged(protocol);
        })

 ValueChanged=@( async text => {
            protocol.maxIterations = text;
            await OnProtocolChanged(protocol);
        })

to set a property, I had first set the property on the class and then feed that class to the update method. I want to streamline the process to something similar to how EF Core sets a property in ExecuteUpdate:

 ValueChanged=@(async text => await OnProtocolChanged(protocol.SetValue(x => x.maxIterations, text)

 ValueChanged=@(async text => await OnProtocolChanged(protocol.SetValue(x => x.maxIterations, text)

looks like EF Core uses this SetPropertyCall class: https://github.com/dotnet/efcore/blob/2e9e879746c3a75ad71b1c3732469c25f01bb8c7/src/EFCore/Extensions/EntityFrameworkQueryableExtensions.cs#L3338 https://learn.microsoft.com/en-us/dotnet/api/microsoft.entityframeworkcore.query.setpropertycalls-1.setproperty?view=efcore-8.0 When I inspected the class on github, I couldn't find anything substantive that I could parse. The best I could do is this:

ValueChanged=@( async text => await OnProtocolChanged(protocol.GetType().GetProperty("Location"), text))

ValueChanged=@( async text => await OnProtocolChanged(protocol.GetType().GetProperty("Location"), text))

SetPropertyCalls.SetProperty Method (Microsoft.EntityFrameworkCore....

Specifies a property and corresponding value it should be updated to in ExecuteUpdate method.

GitHub

efcore/src/EFCore/Extensions/EntityFrameworkQueryableExtensions.cs ...

EF Core is a modern object-database mapper for .NET. It supports LINQ queries, change tracking, updates, and schema migrations. - dotnet/efcore

4 Replies

Joschi•2mo ago

Why don't you use two way binding?

SaiyanslayerOP•2mo ago

I'm looping through values witha foreach loop, IIRC you can't bind those I'll have to try using a for loop instead now that you mention that.

Joschi•2mo ago

You can, but you need to capture the variable in the loop.

foreach(var item in items){
 var capturedItem = item;
<Component @bind="capturedItem'/>
}

foreach(var item in items){
 var capturedItem = item;
<Component @bind="capturedItem'/>
}

SaiyanslayerOP•2mo ago

thats awesome, thanks!

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✅ Better way to set a property using linq?