data-annotations

问题 I'm using dataannotations in an MVC2 app and am a little discouraged when trying to use RESX file resources for error messages. I've tried the following but keep getting the exception "An attribute argument must be a constant expression, typeof expression or array creation expression of an attribute parameter type" [Required(ErrorMessage = Resources.ErrorMessages.Required)] [Required(ErrorMessageResourceName = Resources.ErrorMessages.Required, ErrorMessageResourceType = typeof(Resources

问题 I'm trying to get server-side validation of an Entity Framework String Property to work. Other server-side validation such as data type validation and required dateTime and numeric EF properties are working. This in VS 2010, .Net 4.0, MVC2 + Cloud, ADO.Net Entity Framework. The String Property I am having issues with is mapped to a SQL 2008, Varchar(50) non-nullable column. When I try to post to my Create action with an empty string for this Property, I get the follwing error. Exception

问题 I'm trying to get server-side validation of an Entity Framework String Property to work. Other server-side validation such as data type validation and required dateTime and numeric EF properties are working. This in VS 2010, .Net 4.0, MVC2 + Cloud, ADO.Net Entity Framework. The String Property I am having issues with is mapped to a SQL 2008, Varchar(50) non-nullable column. When I try to post to my Create action with an empty string for this Property, I get the follwing error. Exception

问题 I have an old C# MVC 2.0 web application. Whenever I use a [Required] attribute, the default validation error message goes: The [whatever] field is required. My problem is that the application isn't in English, so I basically have to change the attribute call to [Required(ErrorMessage = "Le champ [whatever] est requis.")] everywhere. Is there a way to override the default error message so I only have to specify it when I want a specific message? I'm looking for something like:

问题 Why can't I do like this? [Required(ErrorMessage = "*")] [RegularExpression("^[a-zA-Z0-9_]*$", ErrorMessage = Resources.RegistrationModel.UsernameError)] public string Username { get; set; } What is the error message telling me? An attribute argument must be a constant expression , typeof expression or array creation expression of an attribute parameter type. 回答1: When you are using the ErrorMessage property only constant strings or string literal can be assigned to it. Use the

问题 Say I have the following model: [Table("Record")] public class RecordModel { [Key] [DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)] [Display(Name = "Record Id")] public int RecordId { get; set; } [StringLength(150)] public string Name { get; set; } [Required] [StringLength(15)] public string IMEI { get; set; } } Is it possible to add an index to the IMEI column through using an attribute, data annotation, or something from the model? 回答1: According to this link: Creating Indexes

问题 I'm using the MetaDataType Attribute on my domain model class. It it supposed to move the attribute information from the referenced class into the class that the MetadataType attribute has been set. But it doesn't do as advertised. What is causing the issue here? [MetadataType(typeof(ComponentModelMetaData))] public partial class Component { public int Id { get; set; } public string Name { get; set; } public ICollection<Repo> Repos { get; set; } public string Description { get; set; } }

问题 I'm using EF 5.0 (CodeFirst) with VS 2012 and am having trouble making a query using SqlQuery. The problem happens in the mapping between the property name of the entity and the name of the column in the database. My entity (model): [Table("Teste")] public class TesteEntity { [Column("Teste_Id")] public int Id { get; set; } [Required] public bool IsAdministrator { get; set; } [Required] public string Name { get; set; } } When I run the query, I get an error. Rotine: List<TesteEntity> list =

问题 I'm using EF 5.0 (CodeFirst) with VS 2012 and am having trouble making a query using SqlQuery. The problem happens in the mapping between the property name of the entity and the name of the column in the database. My entity (model): [Table("Teste")] public class TesteEntity { [Column("Teste_Id")] public int Id { get; set; } [Required] public bool IsAdministrator { get; set; } [Required] public string Name { get; set; } } When I run the query, I get an error. Rotine: List<TesteEntity> list =

问题 Is there a way to trigger client-side validation for the select list created by DropDownListFor? The select list that gets created by the helper doesn't seem to get the "data-val" or "data-val-required" attributes that text inputs get for client-side validation. The validation does occur on the server-side when I check ModelState.IsValid, and the validation message is then displayed on the subsequent page load. I set a default option of "Please Select..." on the list because I want the user