DBContext T4 Template changes for Key Required StringLength Attributes

T4TemplateChanges.cs

// Add at the top with the other Usings
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;

//Add following methods inside the file
private bool IsNullable(TypeUsage usage)
{
    return (bool)usage.Facets.First(facet => facet.Name == "Nullable").Value;
}
 
private bool HasMaxLength(TypeUsage usage)
{
    if (usage.Facets.Any(facet => facet.Name == "MaxLength"))
    {
        return true;
    }
    else
    {
        return false;
    }
}
 
private string MaxLength(TypeUsage usage)
{
    if (usage.Facets.First(facet => facet.Name == "MaxLength").Value.ToString() == "Max")
    {
        return "[DataType(DataType.MultilineText)]";
    }
    else
    {
        return String.Format("[StringLength({0})]", usage.Facets.First(facet => facet.Name == "MaxLength").Value.ToString());
    }
}

string AddSpacesToFields(string text)
{
    if (text == "UAID")
    {
        return text;
    }
    if (string.IsNullOrEmpty(text))
        return "";

    StringBuilder newText = new StringBuilder(text.Length * 2);
    newText.Append(text[0]);
    for (int i = 1; i < text.Length; i++)
    {
        if (char.IsUpper(text[i]))
        {
            if (text[i - 1].ToString() + text[i].ToString() == "ID")
            {
            }
            else
            {
                newText.Append(' ');
            }
        }                
        newText.Append(text[i]);
    }
    return newText.ToString();
}

//Add the following lines inside the WriteProperty(CodeGenerationTools code, EdmProperty edmProperty) method
    MetadataTools ef = new MetadataTools(this);
    if(ef.IsKey(edmProperty)) { #>
    [Key]
<#+ } if (!IsNullable(edmProperty.TypeUsage)) { #>
    [Required]
<#+ } if(HasMaxLength(edmProperty.TypeUsage)) { #>
    <#=MaxLength(edmProperty.TypeUsage) #>
<#+ } #>
    [Display(Name = "<#=AddSpacesToFields(edmProperty.Name)#>")]
<#+