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Route parameter type cannot be parsed (ASP0020)

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Key dotnet.api.unparsable-route-parameter-type · Severity error · Category api

ASP.NET Core analyzer ASP0020. Flags a complex type bound from the route, query or header that has no TryParse. Binding fails at run time.

Incorrect

Section titled “Incorrect”
app.MapGet("/search", ([FromQuery] Filter filter) => Search(filter));


public class Filter { public string Term { get; set; } = ""; }

Correct

Section titled “Correct”
app.MapGet("/search", ([AsParameters] Filter filter) => Search(filter));


public class Filter { public string Term { get; set; } = ""; }