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Avoid nullref while trying to throw a more helpful exception. #55316

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Merged
StephenMolloy merged 2 commits into from
Jul 15, 2021
+6 −3
Merged

Avoid nullref while trying to throw a more helpful exception. #55316

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c5ad5ae
Avoid nullref while trying to throw a more helpful exception.
StephenMolloy Jul 8, 2021
7bbb505
Use resx for error string.
StephenMolloy Jul 13, 2021
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3 changes: 3 additions & 0 deletions src/libraries/System.Private.DataContractSerialization/src/Resources/Strings.resx
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Original file line number Diff line number Diff line change
Expand Up @@ -1167,4 +1167,7 @@
<data name="ReadOnlyCollectionDeserialization" xml:space="preserve">
<value>Collection type '{0}' cannot be deserialized since it</value>
</data>
<data name="UnknownNullType" xml:space="preserve">
<value>Unknown Type for null value</value>
</data>
</root>
6 changes: 3 additions & 3 deletions ...aContractSerialization/src/System/Runtime/Serialization/XmlObjectSerializerReadContext.cs
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Expand Up @@ -361,9 +361,9 @@ public void ReplaceDeserializedObject(string id, object? oldObj, object? newObj)
// throw in such cases to allow us add fix-up support in the future if we need to.
if (DeserializedObjects.IsObjectReferenced(id))
{
// https://github.com/dotnet/runtime/issues/41465 - oldObj or newObj may be null below - suppress compiler error by asserting non-null
Debug.Assert(oldObj != null && newObj != null);
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(XmlObjectSerializer.CreateSerializationException(SR.Format(SR.FactoryObjectContainsSelfReference, DataContract.GetClrTypeFullName(oldObj.GetType()), DataContract.GetClrTypeFullName(newObj.GetType()), id)));
string oldType = (oldObj != null) ? DataContract.GetClrTypeFullName(oldObj.GetType()) : SR.UnknownNullType;
string newType = (newObj != null) ? DataContract.GetClrTypeFullName(newObj.GetType()) : SR.UnknownNullType;
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(XmlObjectSerializer.CreateSerializationException(SR.Format(SR.FactoryObjectContainsSelfReference, oldType, newType, id)));
}
DeserializedObjects.Remove(id);
DeserializedObjects.Add(id, newObj);
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