# UniqueKey Properties

[Type overview](/orleans/docs/api/csharp/microsoft.orleans.core.abstractions/orleans.runtime.uniquekey/)

## BaseTypeCode {#basetypecode-3469e293}

[Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.core.abstractions/orleans.runtime.uniquekey/properties/basetypecode-3469e293/)

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Core.Abstractions/IDs/Legacy/UniqueKey.cs#L40)

```csharp
public int BaseTypeCode
```

## HasKeyExt {#haskeyext-33f8c10a}

[Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.core.abstractions/orleans.runtime.uniquekey/properties/haskeyext-33f8c10a/)

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Core.Abstractions/IDs/Legacy/UniqueKey.cs#L52)

```csharp
public bool HasKeyExt
```

## IdCategory {#idcategory-5e7d99d1}

[Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.core.abstractions/orleans.runtime.uniquekey/properties/idcategory-5e7d99d1/)

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Core.Abstractions/IDs/Legacy/UniqueKey.cs#L42)

```csharp
public Category IdCategory
```

## IsLongKey {#islongkey-152860cd}

[Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.core.abstractions/orleans.runtime.uniquekey/properties/islongkey-152860cd/)

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Core.Abstractions/IDs/Legacy/UniqueKey.cs#L44)

```csharp
public bool IsLongKey
```

## IsSystemTargetKey {#issystemtargetkey-e9a977ab}

[Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.core.abstractions/orleans.runtime.uniquekey/properties/issystemtargetkey-e9a977ab/)

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Core.Abstractions/IDs/Legacy/UniqueKey.cs#L47)

```csharp
public bool IsSystemTargetKey
```

## KeyExt {#keyext-74b05720}

[Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.core.abstractions/orleans.runtime.uniquekey/properties/keyext-74b05720/)

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Core.Abstractions/IDs/Legacy/UniqueKey.cs)

```csharp
[Orleans.Id(3)]
public string? KeyExt
```

## N0 {#n0-c3145e5d}

[Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.core.abstractions/orleans.runtime.uniquekey/properties/n0-c3145e5d/)

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Core.Abstractions/IDs/Legacy/UniqueKey.cs)

```csharp
[Orleans.Id(0)]
public ulong N0
```

## N1 {#n1-c2145cca}

[Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.core.abstractions/orleans.runtime.uniquekey/properties/n1-c2145cca/)

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Core.Abstractions/IDs/Legacy/UniqueKey.cs)

```csharp
[Orleans.Id(1)]
public ulong N1
```

## TypeCodeData {#typecodedata-3579cc3a}

[Dedicated page](/orleans/docs/api/csharp/microsoft.orleans.core.abstractions/orleans.runtime.uniquekey/properties/typecodedata-3579cc3a/)

[Source](https://github.com/dotnet/orleans/blob/e4e752cedecc2976811db49802c7a999b1f1c704/src/Orleans.Core.Abstractions/IDs/Legacy/UniqueKey.cs)

```csharp
[Orleans.Id(2)]
public ulong TypeCodeData
```