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Copy file name to clipboardExpand all lines: docs/csharp/language-reference/compiler-messages/params-arrays.md
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- "CS1670"
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- "CS1751"
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- "CS9218"
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- "CS9219"
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- "CS9220"
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- "CS9221"
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- "CS1670"
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- "CS1751"
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- "CS9218"
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- "CS9219"
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- "CS9220"
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-[**CS1670**](#method-declaration-rules): *`params` is not valid in this context*
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-[**CS1751**](#method-declaration-rules): *Cannot specify a default value for a parameter array.*
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-[**CS9218**](#parameter-and-argument-type-rules): *The type arguments for method cannot be inferred from the usage because an argument with dynamic type is used and the method has a non-array params collection parameter. Try specifying the type arguments explicitly.*
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-[**CS9219**](#parameter-and-argument-type-rules): *Ambiguity between expanded and normal forms of non-array params collection parameter of, the only corresponding argument has the type `dynamic`. Consider casting the dynamic argument.*
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-[**CS9223**](#other-params-errors): *Creation of params collection results in an infinite chain of invocation of constructor.*
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-[**CS9224**](#other-params-errors): *Method cannot be less visible than the member with params collection.*
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-[**CS9225**](#other-params-errors): *Constructor leaves required member uninitialized.*
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-[**CS9227**](#parameter-and-argument-type-rules): *Type does not contain a definition for a suitable instance `Add` method.*
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-[**CS9228**](#parameter-and-argument-type-rules): *Non-array params collection type must have an applicable constructor that can be called with no arguments.*
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In addition, the compiler might produce the following *warning* related to the `params` modifier on method parameters:
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-[**CS9220**](#parameter-and-argument-type-rules): *One or more overloads of method having non-array params collection parameter might be applicable only in expanded form which is not supported during dynamic dispatch.*
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-[**CS9221**](#parameter-and-argument-type-rules): *One or more indexer overloads having non-array params collection parameter might be applicable only in expanded form which is not supported during dynamic dispatch.*
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-[**CS9222**](#parameter-and-argument-type-rules): *One or more constructor overloads having non-array params collection parameter might be applicable only in expanded form which is not supported during dynamic dispatch.*
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## Method declaration rules
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The following errors indicate using a `params` modifier on a parameter when the `params` modifier isn't allowed in that context:
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The following errors indicate that the type of the parameter used with `params` is invalid:
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-**CS9218**: *The type arguments for method cannot be inferred from the usage because an argument with dynamic type is used and the method has a non-array params collection parameter. Try specifying the type arguments explicitly.*
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-**CS9219**: *Ambiguity between expanded and normal forms of non-array params collection parameter of, the only corresponding argument has the type 'dynamic'. Consider casting the dynamic argument.*
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-**CS0225**: *The params parameter must be a single-dimensional array or have a valid collection type*
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-**CS9227**: *Type does not contain a definition for a suitable instance `Add` method.*
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-**CS9228**: *Non-array params collection type must have an applicable constructor that can be called with no arguments.*
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The following warnings indicate that the one of the possible overloads might involve dynamic dispatch. The dynamic nature of the argument doesn't participate in overload resolution.
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-**CS9220**: *One or more overloads of method having non-array params collection parameter might be applicable only in expanded form which is not supported during dynamic dispatch.*
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-**CS9221**: *One or more indexer overloads having non-array params collection parameter might be applicable only in expanded form which is not supported during dynamic dispatch.*
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-**CS9222**: *One or more constructor overloads having non-array params collection parameter might be applicable only in expanded form which is not supported during dynamic dispatch.*
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In versions before C# 13, the `params` modifier is allowed on single-dimensional arrays only. No other types were valid.
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Starting with C# 13 any valid collection type can be used. However, some restrictions remain. The collection type must follow the same rules as the target of a [collection expression](../operators/collection-expressions.md#conversions).
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