What is the assembly reference for Attribute class

Nalini Raghavan

Hi,

I am trying to insert this class in my html helper but seem to be missing an assembly reference. Can you pls advice?here is my code im trying to insert into html helper:

[AttributeUsage(AttributeTargets.Class, AllowMultiple = true)]

public class AtLeastOnePropertyAttribute : ValidationAttribute

{

private string[] PropertyList { get; set; }

public AtLeastOnePropertyAttribute(params string[] propertyList)

{

this.PropertyList = propertyList;

}

//See http://stackoverflow.com/a/1365669

public override object TypeId

{

get

{

return this;

}

public override bool IsValid(object value)

{

PropertyInfo propertyInfo;

foreach (string propertyName in PropertyList)

{

propertyInfo = value.GetType().GetProperty(propertyName);

if (propertyInfo != null && propertyInfo.GetValue(value, null) != null)

{

return true;

}

return false;

}

2 Replies

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Ramesh Palanivel8y ago
Accepted answer
Hi Nalini,

Add the below namespaces in your page,

using System;
using System.Object;
using System.Attribute;
Nalini Raghavan8y ago
Hi Ramesh,

Now, I added the assembly reference .The validation for checking if the user has input atleast one field of the three text boxes from

HomePhone", "CellPhone", "WokPhone is filled.

But the validation doesnt work. Here is my code:

HTML Helper:
[AttributeUsage(AttributeTargets.Class, AllowMultiple = true)]
public class AtLeastOnePropertyAttribute : ValidationAttribute
{
private string[] PropertyList { get; set; }

public AtLeastOnePropertyAttribute(params string[] propertyList)
{
this.PropertyList = propertyList;
}


public override object TypeId
{
get
{
return this;
}
}

public override bool IsValid(object value)
{
PropertyInfo propertyInfo;
foreach (string propertyName in PropertyList)
{
propertyInfo = value.GetType().GetProperty(propertyName);

if (propertyInfo != null && propertyInfo.GetValue(value, null) != null)
{
return true;
}
}

return false;
}
}
Model:
[AtLeastOneProperty("HomePhone", "CellPhone", "WokPhone", ErrorMessage="You must supply at least one value")]