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Mar 7, 2022
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System.MissingFieldException F# snippet #7793

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MissingFieldException F# snippet
albert-du Mar 5, 2022
7632752
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albert-du Mar 5, 2022
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48 changes: 48 additions & 0 deletions snippets/fsharp/System/MissingFieldException/Overview/MissingMethodException.fs
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//<snippet1>
open System
open System.Reflection

type App = class end

//<snippet2>
try
// Attempt to call a static DoSomething method defined in the App class.
// However, because the App class does not define this method,
// a MissingMethodException is thrown.
typeof<App>.InvokeMember("DoSomething", BindingFlags.Static ||| BindingFlags.InvokeMethod, null, null, null)
|> ignore
with :? MissingMethodException as e ->
// Show the user that the DoSomething method cannot be called.
printfn $"Unable to call the DoSomething method: {e.Message}"
//</snippet2>

//<snippet3>
try
// Attempt to access a static AField field defined in the App class.
// However, because the App class does not define this field,
// a MissingFieldException is thrown.
typeof<App>.InvokeMember("AField", BindingFlags.Static ||| BindingFlags.SetField, null, null, [| box 5 |])
|> ignore
with :? MissingFieldException as e ->
// Show the user that the AField field cannot be accessed.
printfn $"Unable to access the AField field: {e.Message}"
//</snippet3>

//<snippet4>
try
// Attempt to access a static AnotherField field defined in the App class.
// However, because the App class does not define this field,
// a MissingFieldException is thrown.
typeof<App>.InvokeMember("AnotherField", BindingFlags.Static ||| BindingFlags.GetField, null, null, null)
|> ignore
with :? MissingMemberException as e ->
// Notice that this code is catching MissingMemberException which is the
// base class of MissingMethodException and MissingFieldException.
// Show the user that the AnotherField field cannot be accessed.
printfn $"Unable to access the AnotherField field: {e.Message}"
//</snippet4>
// This code example produces the following output:
// Unable to call the DoSomething method: Method 'App.DoSomething' not found.
// Unable to access the AField field: Field 'App.AField' not found.
// Unable to access the AnotherField field: Field 'App.AnotherField' not found.
//</snippet1>
10 changes: 10 additions & 0 deletions snippets/fsharp/System/MissingFieldException/Overview/fs.fsproj
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<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<OutputType>Exe</OutputType>
<TargetFramework>net6.0</TargetFramework>
</PropertyGroup>

<ItemGroup>
<Compile Include="MissingMethodException.fs" />
</ItemGroup>
</Project>
2 changes: 2 additions & 0 deletions xml/System/MissingFieldException.xml
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Expand Up @@ -72,6 +72,7 @@

:::code language="cpp" source="~/snippets/cpp/VS_Snippets_CLR/MissingMethodException/cpp/MissingMethodException.cpp" id="Snippet1":::
:::code language="csharp" source="~/snippets/csharp/System/MissingFieldException/Overview/MissingMethodException.cs" interactive="try-dotnet" id="Snippet1":::
:::code language="fsharp" source="~/snippets/fsharp/System/MissingFieldException/Overview/MissingMethodException.fs" id="Snippet1":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR/MissingMethodException/vb/missingmethodexception.vb" id="Snippet1":::

]]></format>
Expand Down Expand Up @@ -399,6 +400,7 @@

:::code language="cpp" source="~/snippets/cpp/VS_Snippets_CLR/MissingMethodException/cpp/MissingMethodException.cpp" id="Snippet3":::
:::code language="csharp" source="~/snippets/csharp/System/MissingFieldException/Overview/MissingMethodException.cs" id="Snippet3":::
:::code language="fsharp" source="~/snippets/fsharp/System/MissingFieldException/Overview/MissingMethodException.fs" id="Snippet3":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR/MissingMethodException/vb/missingmethodexception.vb" id="Snippet3":::

]]></format>
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2 changes: 2 additions & 0 deletions xml/System/MissingMemberException.xml
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Expand Up @@ -76,6 +76,7 @@

:::code language="cpp" source="~/snippets/cpp/VS_Snippets_CLR/MissingMethodException/cpp/MissingMethodException.cpp" id="Snippet1":::
:::code language="csharp" source="~/snippets/csharp/System/MissingFieldException/Overview/MissingMethodException.cs" interactive="try-dotnet" id="Snippet1":::
:::code language="fsharp" source="~/snippets/fsharp/System/MissingFieldException/Overview/MissingMethodException.fs" id="Snippet1":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR/MissingMethodException/vb/missingmethodexception.vb" id="Snippet1":::

]]></format>
Expand Down Expand Up @@ -557,6 +558,7 @@

:::code language="cpp" source="~/snippets/cpp/VS_Snippets_CLR/MissingMethodException/cpp/MissingMethodException.cpp" id="Snippet4":::
:::code language="csharp" source="~/snippets/csharp/System/MissingFieldException/Overview/MissingMethodException.cs" id="Snippet4":::
:::code language="fsharp" source="~/snippets/fsharp/System/MissingFieldException/Overview/MissingMethodException.fs" id="Snippet4":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR/MissingMethodException/vb/missingmethodexception.vb" id="Snippet4":::

]]></format>
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2 changes: 2 additions & 0 deletions xml/System/MissingMethodException.xml
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Expand Up @@ -77,6 +77,7 @@ The exact timing of when statically referenced methods are loaded is unspecified

:::code language="cpp" source="~/snippets/cpp/VS_Snippets_CLR/MissingMethodException/cpp/MissingMethodException.cpp" id="Snippet1":::
:::code language="csharp" source="~/snippets/csharp/System/MissingFieldException/Overview/MissingMethodException.cs" interactive="try-dotnet" id="Snippet1":::
:::code language="fsharp" source="~/snippets/fsharp/System/MissingFieldException/Overview/MissingMethodException.fs" id="Snippet1":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR/MissingMethodException/vb/missingmethodexception.vb" id="Snippet1":::

]]></format>
Expand Down Expand Up @@ -408,6 +409,7 @@ The exact timing of when statically referenced methods are loaded is unspecified

:::code language="cpp" source="~/snippets/cpp/VS_Snippets_CLR/MissingMethodException/cpp/MissingMethodException.cpp" id="Snippet2":::
:::code language="csharp" source="~/snippets/csharp/System/MissingFieldException/Overview/MissingMethodException.cs" id="Snippet2":::
:::code language="fsharp" source="~/snippets/fsharp/System/MissingFieldException/Overview/MissingMethodException.fs" id="Snippet2":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_CLR/MissingMethodException/vb/missingmethodexception.vb" id="Snippet2":::

]]></format>
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