DropdownBase.SelectItem Invalid Cast Exception when using Value Property #662

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claunia · 2026-01-29T17:41:10Z

claunia commented

2026-01-29 17:41:10 +00:00

Originally created by @groogiam on GitHub (Dec 6, 2022).

Describe the bug
The recent updates to optimize value selection appear to have broken the SelectItem method.

To Reproduce
Steps to reproduce the behavior:
See unit test code snippet using Radzen.Blazor 4.4.0

        [Fact]
        public async Task Dropdown_SelectItem_Method_Should_Not_Throw()
        {
            using var ctx = new TestContext();

            ctx.JSInterop.Mode = JSRuntimeMode.Loose;

            var component = DropDown<int>(ctx);

            var items = component.FindAll(".rz-dropdown-item");

            Assert.Equal(2, items.Count);

            //this throws
            await component.InvokeAsync(async () => await component.Instance.SelectItem(1));
        }

Alternatively link your repo with a sample project that can be run.

Expected behavior
Before the update SelectItem would take the value that you wanted set not an instance of the bound object type.

Originally created by @groogiam on GitHub (Dec 6, 2022).  **Describe the bug** The recent updates to optimize value selection appear to have broken the SelectItem method. **To Reproduce** Steps to reproduce the behavior: See unit test code snippet using Radzen.Blazor 4.4.0 ```csharp [Fact] public async Task Dropdown_SelectItem_Method_Should_Not_Throw() { using var ctx = new TestContext(); ctx.JSInterop.Mode = JSRuntimeMode.Loose; var component = DropDown<int>(ctx); var items = component.FindAll(".rz-dropdown-item"); Assert.Equal(2, items.Count); //this throws await component.InvokeAsync(async () => await component.Instance.SelectItem(1)); } ``` Alternatively link your repo with a sample project that can be run. **Expected behavior** Before the update SelectItem would take the value that you wanted set not an instance of the bound object type.

claunia closed this issue

2026-01-29 17:41:10 +00:00

claunia commented

2026-01-29 17:41:11 +00:00

@enchev commented on GitHub (Dec 7, 2022):

Hi @groogiam,

This test failed with 4.4.0 as well:

@enchev commented on GitHub (Dec 7, 2022): Hi @groogiam, This test failed with 4.4.0 as well: ![image](https://user-images.githubusercontent.com/5804953/206113802-a365d290-5f68-4eb3-aa27-9f9b691442c9.png) ![image](https://user-images.githubusercontent.com/5804953/206113848-f7538603-43e2-44fc-92a5-2b1d4353ac84.png)

claunia commented

2026-01-29 17:41:11 +00:00

@groogiam commented on GitHub (Dec 7, 2022):

Sorry I think my original post was not clear. This appears to be a regression from somewhere between 3.x and 4.x. It worked in 3.x but does not work in 4.4 and above. Looks like this might have been this commit b0baad56e7.

@groogiam commented on GitHub (Dec 7, 2022): Sorry I think my original post was not clear. This appears to be a regression from somewhere between 3.x and 4.x. It worked in 3.x but does not work in 4.4 and above. Looks like this might have been this commit https://github.com/radzenhq/radzen-blazor/commit/b0baad56e7845c917106390076e573c7a37ace4f.

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Reference: starred/radzen-blazor#662