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AnswerRe: Subjective question: which one of these Lazy Init is best Pin
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GeneralRe: Subjective question: which one of these Lazy Init is best Pin
BillWoodruff21-Oct-17 1:44
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GeneralRe: Subjective question: which one of these Lazy Init is best Pin
Super Lloyd21-Oct-17 2:21
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QuestionRe: Subjective question: which one of these Lazy Init is best Pin
Super Lloyd20-Oct-17 22:10
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AnswerRe: Subjective question: which one of these Lazy Init is best Pin
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GeneralRe: Subjective question: which one of these Lazy Init is best Pin
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QuestionAttributes on fields in a DataTable/DataRow Pin
hpjchobbes18-Oct-17 11:27
hpjchobbes18-Oct-17 11:27 
I am using a DataRow to get and set values (based on the manually typed data table from How to Manually Create a Typed DataTable[^]. The fields in the datarow can have different attributes that I would need to track, the main one being a maximum number of characters for some strings, but different versions have different lengths. I was trying to use Attributes to help with this, but I am stuck with how to be able to set/determine the 'version' when going through the attributes. I'd like to be able to set the version on the dataset as a whole and have the fields of the data row be able to use that to determine how to get values.

Here's how I setup my attribute class:
C#
[AttributeUsage(AttributeTargets.Property, AllowMultiple =true)]
public class MaxLengthAttribute : Attribute
{

    public string Version;
    public int MaxLength;

    public MaxLengthAttribute(string version, int max)
    {
       Version= version;
       MaxLength = max;
    }
}
Here's what the data row looks like and how I am envisioning this would work.
C#
public CustomerRow : DataRow
{
   [MaxLength("1.0", 40)]
   [MaxLength("2.0", 45)]
   public string Name
   {
        get
        {
            if(base["Name"] == DBNull.Value) throw new NullException("Name is null.");
            return ((TruncatedString)base["Name"]).Value;
        }
   }
}
I created a class called TruncatedString that has a string and bool, which i am using as the data type for the field in the data row. In the TruncatedString I am trying to get the version of the data set and the max length attribute to find out how long my field can be:
C#
public class TruncatedString
{
    public bool AutoTruncate;
    private string _Value;
    public string Value
    {
        get
        {
            if(AutoTruncate)
            {
                int maxLength = ???
                // How to get the version from the DataSet
                // And the MaxLength attribute for the field in the data row
                if(maxLength >= 0 && Value.Length > maxLength) return _Value.Substring(0, maxLength);
            }
                return _Value;
         }
         set { _Value = value; }
    }
}


I am not sure if Attributes are the best way to go with this setup, but I do need to be able to store the untruncated string as well as a way to get the truncated but be able to have different lengths for different versions. I also want to be able to do other attributes, for example a field that was added in version 2.0 but not available in 1.0.
AnswerRe: Attributes on fields in a DataTable/DataRow Pin
Gerry Schmitz18-Oct-17 19:08
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QuestionHow to reverse an array without using Array.Reverse()? Pin
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AnswerRe: How to reverse an array without using Array.Reverse()? Pin
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QuestionHow to prevent stopping application Pin
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QuestionC# - run exe from within a form, and keep the exe's borders within the actual boundary of the form... Pin
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AnswerRe: C# - run exe from within a form, and keep the exe's borders within the actual boundary of the form... Pin
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