public sealed class SystemParameterRule : IMessage<SystemParameterRule>, IEquatable<SystemParameterRule>, IDeepCloneable<SystemParameterRule>, IBufferMessage, IMessage
Define a system parameter rule mapping system parameter definitions to
methods.
public RepeatedField<SystemParameter> Parameters { get; }
Define parameters. Multiple names may be defined for a parameter.
For a given method call, only one of them should be used. If multiple
names are used the behavior is implementation-dependent.
If none of the specified names are present the behavior is
parameter-dependent.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-28 UTC."],[[["\u003cp\u003e\u003ccode\u003eSystemParameterRule\u003c/code\u003e is a class that maps system parameter definitions to methods, and it implements several interfaces like \u003ccode\u003eIMessage\u003c/code\u003e, \u003ccode\u003eIEquatable\u003c/code\u003e, \u003ccode\u003eIDeepCloneable\u003c/code\u003e, and \u003ccode\u003eIBufferMessage\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003eThe class includes fields like \u003ccode\u003eParametersFieldNumber\u003c/code\u003e and \u003ccode\u003eSelectorFieldNumber\u003c/code\u003e, properties such as \u003ccode\u003eDescriptor\u003c/code\u003e, \u003ccode\u003eParameters\u003c/code\u003e, \u003ccode\u003eParser\u003c/code\u003e, and \u003ccode\u003eSelector\u003c/code\u003e, and various methods like \u003ccode\u003eClone()\u003c/code\u003e, \u003ccode\u003eEquals()\u003c/code\u003e, \u003ccode\u003eMergeFrom()\u003c/code\u003e, and \u003ccode\u003eWriteTo()\u003c/code\u003e for managing and manipulating the system parameter rules.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eSystemParameterRule\u003c/code\u003e allows defining multiple names for a parameter, but only one should be used in a method call, and the behavior if none are present is parameter-dependent.\u003c/p\u003e\n"],["\u003cp\u003eThe class \u003ccode\u003eSystemParameterRule\u003c/code\u003e has available constructors \u003ccode\u003eSystemParameterRule()\u003c/code\u003e and \u003ccode\u003eSystemParameterRule(SystemParameterRule other)\u003c/code\u003e to create instances.\u003c/p\u003e\n"],["\u003cp\u003eThis class has a selector property that is a string and selects the methods to which the rule applies, using '*' for all methods in all APIs, and it can be set or obtained via \u003ccode\u003eSelector\u003c/code\u003e.\u003c/p\u003e\n"]]],[],null,["# Class SystemParameterRule (2.17.0)\n\nVersion latestkeyboard_arrow_down\n\n- [2.17.0 (latest)](/dotnet/docs/reference/Google.Api.CommonProtos/latest/Google.Api.SystemParameterRule)\n- [2.15.0](/dotnet/docs/reference/Google.Api.CommonProtos/2.15.0/Google.Api.SystemParameterRule)\n- [2.10.0](/dotnet/docs/reference/Google.Api.CommonProtos/2.10.0/Google.Api.SystemParameterRule)\n- [2.2.0](/dotnet/docs/reference/Google.Api.CommonProtos/2.2.0/Google.Api.SystemParameterRule) \n\n public sealed class SystemParameterRule : IMessage\u003cSystemParameterRule\u003e, IEquatable\u003cSystemParameterRule\u003e, IDeepCloneable\u003cSystemParameterRule\u003e, IBufferMessage, IMessage\n\nDefine a system parameter rule mapping system parameter definitions to\nmethods. \n\nInheritance\n-----------\n\n[object](https://learn.microsoft.com/dotnet/api/system.object) \\\u003e SystemParameterRule \n\nImplements\n----------\n\n[IMessage](https://cloud.google.com/dotnet/docs/reference/Google.Protobuf/latest/Google.Protobuf.IMessage-1.html)[SystemParameterRule](/dotnet/docs/reference/Google.Api.CommonProtos/latest/Google.Api.SystemParameterRule), [IEquatable](https://learn.microsoft.com/dotnet/api/system.iequatable-1)[SystemParameterRule](/dotnet/docs/reference/Google.Api.CommonProtos/latest/Google.Api.SystemParameterRule), [IDeepCloneable](https://cloud.google.com/dotnet/docs/reference/Google.Protobuf/latest/Google.Protobuf.IDeepCloneable-1.html)[SystemParameterRule](/dotnet/docs/reference/Google.Api.CommonProtos/latest/Google.Api.SystemParameterRule), [IBufferMessage](https://cloud.google.com/dotnet/docs/reference/Google.Protobuf/latest/Google.Protobuf.IBufferMessage.html), [IMessage](https://cloud.google.com/dotnet/docs/reference/Google.Protobuf/latest/Google.Protobuf.IMessage.html) \n\nInherited Members\n-----------------\n\n[object.Equals(object, object)](https://learn.microsoft.com/dotnet/api/system.object.equals#system-object-equals(system-object-system-object)) \n[object.GetType()](https://learn.microsoft.com/dotnet/api/system.object.gettype) \n[object.ReferenceEquals(object, object)](https://learn.microsoft.com/dotnet/api/system.object.referenceequals)\n\nNamespace\n---------\n\n[Google.Api](/dotnet/docs/reference/Google.Api.CommonProtos/latest/Google.Api)\n\nAssembly\n--------\n\nGoogle.Api.CommonProtos.dll\n\nConstructors\n------------\n\n### SystemParameterRule()\n\n public SystemParameterRule()\n\n### SystemParameterRule(SystemParameterRule)\n\n public SystemParameterRule(SystemParameterRule other)\n\nFields\n------\n\n### ParametersFieldNumber\n\n public const int ParametersFieldNumber = 2\n\nField number for the \"parameters\" field.\n\n### SelectorFieldNumber\n\n public const int SelectorFieldNumber = 1\n\nField number for the \"selector\" field.\n\nProperties\n----------\n\n### Descriptor\n\n public static MessageDescriptor Descriptor { get; }\n\n### Parameters\n\n public RepeatedField\u003cSystemParameter\u003e Parameters { get; }\n\nDefine parameters. Multiple names may be defined for a parameter.\nFor a given method call, only one of them should be used. If multiple\nnames are used the behavior is implementation-dependent.\nIf none of the specified names are present the behavior is\nparameter-dependent.\n\n### Parser\n\n public static MessageParser\u003cSystemParameterRule\u003e Parser { get; }\n\n### Selector\n\n public string Selector { get; set; }\n\nSelects the methods to which this rule applies. Use '\\*' to indicate all\nmethods in all APIs.\n\nRefer to \\[selector\\]\\[google.api.DocumentationRule.selector\\] for syntax\ndetails.\n\nMethods\n-------\n\n### CalculateSize()\n\n public int CalculateSize()\n\n### Clone()\n\n public SystemParameterRule Clone()\n\n### Equals(SystemParameterRule)\n\n public bool Equals(SystemParameterRule other)\n\n### Equals(object)\n\n public override bool Equals(object other)\n\n**Overrides** \n[object.Equals(object)](https://learn.microsoft.com/dotnet/api/system.object.equals#system-object-equals(system-object))\n\n### GetHashCode()\n\n public override int GetHashCode()\n\n**Overrides** \n[object.GetHashCode()](https://learn.microsoft.com/dotnet/api/system.object.gethashcode)\n\n### MergeFrom(SystemParameterRule)\n\n public void MergeFrom(SystemParameterRule other)\n\n### MergeFrom(CodedInputStream)\n\n public void MergeFrom(CodedInputStream input)\n\n### ToString()\n\n public override string ToString()\n\n**Overrides** \n[object.ToString()](https://learn.microsoft.com/dotnet/api/system.object.tostring)\n\n### WriteTo(CodedOutputStream)\n\n public void WriteTo(CodedOutputStream output)"]]
