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Note that you can use String.Format placeholders #2011

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Merged
rpetrusha merged 4 commits into from
Mar 11, 2019
Merged

Note that you can use String.Format placeholders #2011

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Note that you can use string.Format placeholders
tdykstra Mar 11, 2019
d467dc4
Add line break
tdykstra Mar 11, 2019
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feedback
tdykstra Mar 11, 2019
d6e2e74
make vb example consistent with c#
tdykstra Mar 11, 2019
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18 changes: 14 additions & 4 deletions xml/System.ComponentModel.DataAnnotations/StringLengthAttribute.xml
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Expand Up @@ -38,9 +38,11 @@
<format type="text/markdown"><![CDATA[

## Remarks
ASP.NET Dynamic Data enables CRUD (Create, Read, Update and Delete) operations in a data model. You can specify the minimum and maximum length of characters for each field when data is being inserted or updated. For character data types, the <xref:System.ComponentModel.DataAnnotations.StringLengthAttribute.MinimumLength%2A> and <xref:System.ComponentModel.DataAnnotations.StringLengthAttribute.MaximumLength%2A> properties identify the largest number of bytes that are required in order to store a string.


ASP.NET Dynamic Data enables CRUD (Create, Read, Update and Delete) operations in a data model. You can specify the minimum and maximum length of characters for each field when data is being inserted or updated. For character data types, the <xref:System.ComponentModel.DataAnnotations.StringLengthAttribute.MinimumLength%2A> and <xref:System.ComponentModel.DataAnnotations.StringLengthAttribute.MaximumLength%2A> properties identify the largest number of bytes that are required in order to store a string.

You can use [composite formatting](~/docs/standard/base-types/composite-formatting.md) placeholders in the error message:
{0} is the name of the property; {1} is the maximum length; and {2} is the minimum length.
The placeholders correspond to arguments that are passed to the <xref:System.String.Format%2A?displayProperty=nameWithType> method at runtime.

## Examples
The following example shows how to limit the number of characters in a field. This example works with the ThumbnailPhotoFileName field in the Products table in the AdventureWorksLT database. The field is limited 4 characters by applying the <xref:System.ComponentModel.DataAnnotations.StringLengthAttribute> attribute to the partial class that represents the Product entity.
Expand All @@ -59,6 +61,10 @@ public class ProductMetadata
[StringLength(4, ErrorMessage = "The ThumbnailPhotoFileName value cannot exceed 4 characters. ")]
public object ThumbnailPhotoFileName;

[ScaffoldColumn(true)]
[StringLength(4, ErrorMessage = "The {0} value cannot exceed {1} characters. ")]
public object PhotoFileName;

}
```

Expand All @@ -74,6 +80,10 @@ Public Class ProductMetadata
<StringLength(4, ErrorMessage := "The ThumbnailPhotoFileName value cannot exceed 4 characters. ")> _
Public ThumbnailPhotoFileName As Object

<ScaffoldColumn(True)> _
<StringLength(4, ErrorMessage := "The {0} value cannot exceed {1} characters. ")> _
Public PhotoFileName As Object

End Class
```

Expand Down Expand Up @@ -267,4 +277,4 @@ End Class
</Docs>
</Member>
</Members>
</Type>
</Type>