DevForce Community Forum : Retreive max string length at runtime

Retreive max string length at runtime : Hello again Chuck, You might...

Mon, 21 Mar 2011 10:44:02 -700

Author: sbelini
Subject: 2571
Posted: 21-Mar-2011 at 10:44am

Hello again Chuck,

You might actually be able to do that by using reflection:

public void GetMaxStringLengthSample() {

var maxStringLength = GetMaxStringLengthAttribute(typeof(Customer),

Customer.PropertyMetadata.CompanyName.Name);

Assert.IsTrue(maxStringLength == 40, "This should not fail");

}

public int GetMaxStringLengthAttribute(Type entityType, String propertyName) {

var propertyInfo = entityType.GetProperty(propertyName);

var attributes = (StringLengthVerifierAttribute)propertyInfo

.GetCustomAttributes(typeof(StringLengthVerifierAttribute), false).First();

return attributes.MaxValue;

}

You can also find this snippet in its original thread at http://www.ideablade.com/forum/forum_posts.asp?TID=2152&title=string-field-maxlength

Silvio.

Retreive max string length at runtime : Hi Chuck, Unfortunatelly this...

Mon, 21 Mar 2011 02:31:55 -700

Author: sbelini
Subject: 2571
Posted: 21-Mar-2011 at 2:31am

Hi Chuck,

Unfortunatelly this is not a trivial task. You will need to retrieve this information from the EDMX. There is some information on how to do this at http://blogs.msdn.com/b/adonet/archive/2008/01/24/how-to-extract-csdl-from-edmx.aspx.

The link above has been posted in a previous thread at http://www.ideablade.com/forum/forum_posts.asp?TID=2403&KW=maxlength&PID=9482&title=fixedlength-fields, where someone had a similar question.

I hope it helps,

Silvio.

Retreive max string length at runtime : Simple question:How does one retrieve...

Sun, 20 Mar 2011 18:01:09 -700

Author: chuckc
Subject: 2571
Posted: 20-Mar-2011 at 6:01pm

Simple question:

How does one retrieve the max length of a entity string field at runtime? I see the value provided to the StringLengthVerifier, but what is the technique to get that value for use in my own code?

  /// Gets or sets the Description.     [Bindable(true, BindingDirection.TwoWay)]    [Editable(true)]    [Display(Name="Description", AutoGenerateField=true)]    [IbVal.StringLengthVerifier(MaxValue=1000, IsRequired=false, ErrorMessageResourceName="AccountTransactionDetail_Description")]    [DataMember]    public string Description {      get { return PropertyMetadata.Description.GetValue(this); }      set { PropertyMetadata.Description.SetValue(this, value); }    }

Thanks!