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@jkotas jkotas commented Feb 11, 2020

Summary

Document breaking change dotnet/runtime#11571

Fixes #3851

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Left a couple suggestions. @BillWagner Do you think "init-only" is acceptable terminology?

Co-Authored-By: Genevieve Warren <[email protected]>
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Approved with two more suggestions, incorporating feedback from @BillWagner .

## Remarks
This method will assign `value` to the field reflected by this instance on object `obj`. If the field is static, `obj` will be ignored. For non-static fields, `obj` should be an instance of a class that inherits or declares the field. The new value is passed as an `Object`. For example, if the field's type is Boolean, an instance of `Object` with the appropriate Boolean value is passed. Before setting the value, `SetValue` checks to see if the user has access permission. This final method is a convenience method for calling the following `SetValue` method.
This method cannot be used to set values of static init-only (`readonly` in C#) fields reliably. In .NET Core 3.0 and later versions, an exception is thrown if you attempt to set a value on a static init-only field.
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Suggested change
This method cannot be used to set values of static init-only (`readonly` in C#) fields reliably. In .NET Core 3.0 and later versions, an exception is thrown if you attempt to set a value on a static init-only field.
This method cannot be used to set values of static, `init-only` (`readonly` in C#) fields reliably. In .NET Core 3.0 and later versions, an exception is thrown if you attempt to set a value on a static, `init-only` field.

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static and init-only are similar kind of qualifiers. I would either put back-ticks around both or neither.

I do not have a strong opinion about it. I would be happy to apply the suggestion if you prefer to have only init-only in back-ticks. Let me know.

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In the ECMA spec, they refer to the initonly attribute, but when not referring to a keyword, they use init-only as the general term. So I agree, I don't think we need the backticks here. @BillWagner?

https://www.ecma-international.org/publications/files/ECMA-ST/ECMA-335.pdf

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But we do need a comma between static and init-only.

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But we do need a comma between static and init-only.

Fixed

## Remarks
This method will assign `value` to the field reflected by this instance on `obj`. If the field is static, `obj` will be ignored. For non-static fields, `obj` should be an instance of a class that inherits or declares the field. The new value is passed as an `Object`. For example, if the field's type is `Boolean`, an instance of `Object` with the appropriate Boolean value is passed. Before setting the value, `SetValue` checks to see if the user has access permission.
This method cannot be used to set values of static init-only (`readonly` in C#) fields reliably. In .NET Core 3.0 and later versions, an exception is thrown if you attempt to set a value on a static init-only field.
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Suggested change
This method cannot be used to set values of static init-only (`readonly` in C#) fields reliably. In .NET Core 3.0 and later versions, an exception is thrown if you attempt to set a value on a static init-only field.
This method cannot be used to set values of static, `init-only` (`readonly` in C#) fields reliably. In .NET Core 3.0 and later versions, an exception is thrown if you attempt to set a value on a static, `init-only` field.

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More commas

@BillWagner BillWagner merged commit d3d1f28 into dotnet:master Mar 2, 2020
@jkotas jkotas deleted the patch-1 branch December 8, 2021 18:07
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FieldBuilder.SetValue for static init-only fields in .NET Core 3.0+
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