How to Add Validation Attributes to Runtime Properties in C#?

Adding Attributes to Runtime Properties

In your attempt to add a validation attribute to a property at runtime, you've encountered an exception stating "Collection was of a fixed size." To resolve this issue, consider the following:

The code you've provided involves invoking the FillAttributes method. This particular method, however, expects an array of attributes as its argument, not a single attribute. To rectify this, you should modify your code to pass an array containing the desired attribute:

// Create an array of attributes
var attributes = new ValidationAttribute[] { attribute };

// Invoke FillAttribute method
methodInfo.Invoke(propDesc, new object[] { attributes });

Alternatively, you could bypass the FillAttributes method entirely and directly assign the attribute to the property descriptor:

// Assign attribute to property descriptor
propDesc.Attributes = new Attribute[] { new RequiredAttribute() };

Depending on the specific scenario and your design preferences, entweder of these approaches should allow you to add attributes to properties at runtime without encountering the "Collection was of a fixed size" exception.

The above is the detailed content of How to Add Validation Attributes to Runtime Properties in C#?. For more information, please follow other related articles on the PHP Chinese website!