为什么总是StringValidator失败的自定义配置节？

问题描述

我已经从配置节继承创建一个C＃类库自定义配置节。我引用类库在我的web应用程序（也C＃，ASP.NET），填写相应的属性，一切的伟大工程。当我开始添加验证问题开始。

I have created a custom configuration section in a c# class library by inheriting from ConfigurationSection. I reference the class library in my web application (also c#, ASP.NET), fill in the appropriate attributes and everything works great. The problem starts when I start adding validators.

例如，此属性：

    [ConfigurationProperty("appCode", IsRequired = true)]
    public string ApplicationCode
    {
        get
        {
            return (string)base["appCode"];
        }
        set
        {
            base["appCode"] = value;
        }
    }

正如它工作正常，但只要我补充一点：

As is it works fine, but as soon as I add this:

    [StringValidator(MinLength=1)]

它的炸弹，出现以下错误：

It bombs with the following error:

的的属性appCode'的值无效。错误是：该字符串必须至少有1个字符的

我得到这个错误，即使一个有效的 appCode 值是在我的的web.config 文件。如果我删除了验证它完美。有谁知道如何解决这个问题？

I get this error even though a valid appCode value is in my web.config file. If I remove the validator it works perfectly. Does anyone know how to get around this?

推荐答案

我是能够通过使用显式的为重点，以我的属性集合，而不是一个字符串，按以下实现：

I was able to work around this issue by using an explicit ConfigurationProperty as the key to my properties collection rather than a string, as per the following implementation:

public class AssemblyElement : ConfigurationElement
{
    private static readonly ConfigurationProperty _propAssembly;
    private static readonly ConfigurationPropertyCollection _properties;

    static AssemblyElement()
    {
        _propAssembly = new ConfigurationProperty("assembly", typeof(string), null, null, new StringValidator(1), ConfigurationPropertyOptions.IsKey | ConfigurationPropertyOptions.IsRequired);
        _properties = new ConfigurationPropertyCollection();
        _properties.Add(_propAssembly);
    }

    internal AssemblyElement() { }
    public AssemblyElement(string assemblyName)
    {
        this.Assembly = assemblyName;
    }

    [ConfigurationProperty("assembly", IsRequired = true, IsKey = true, DefaultValue = "")]
    [StringValidator(MinLength = 1)]
    public string Assembly
    {
        get { return (string)base[_propAssembly]; }
        set { base[_propAssembly] = value; }
    }

    internal AssemblyName AssemblyName
    {
        get { return new AssemblyName(this.Assembly); }
    }

    protected override ConfigurationPropertyCollection Properties
    {
        get { return _properties; }
    }
}

（此代码贴切地反映代码为蓝本从配置元素类。我仍然希望我没有重复我的验证，但至少这段代码可以让我指定一个空白的默认值，同时还要求要输入一个值。）

(This code is closely modeled after the code reflected from the AssemblyInfo configuration element class. I still wish I didn't have to duplicate my validations, but at least this code allows me to specify a blank default value while still requiring a value to be entered.)

这篇关于为什么总是StringValidator失败的自定义配置节？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！