如何自定义 text-danger 给出的验证错误消息? [英] How to customize validation error message given by text-danger?

问题描述

我的 MVC .NET Core 项目的一个页面上有一个下拉列表，我想为其自定义默认验证文本.

I have a dropdown list on one of my pages in my MVC .NET Core project that I want to customise the default validation text for.

<select asp-for="ProductID" class="form-control" asp-items="ViewBag.ProductID">
    <option value="">--Select Product --</option>
</select>
<span asp-validation-for="ProductID" class="text-danger" />

给出的标准验证错误消息是产品 ID 字段是必需的".我想把它改成别的东西.

The standard validation error message given is "The Product ID field is required". I want to change this to something else.

我试过用这个

 <span asp-validation-for="ProductID" class="text-danger">Please enter a product</span>

但是当页面加载而不是单击按钮时会显示错误消息

But the error message displays when the page loads instead of when the button is clicked

自定义验证文本的适当方法是什么?

What is the appropriate way to customise validation text?

推荐答案

一般是在你想要返回Controller的ViewModel中完成:

That's normally done in the ViewModel you want to return to the Controller:

public class SomeViewModel
{
    [Required(ErrorMessage = "Your elegant error message goes here")]
    public int ProductId { get; set; }
}

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