从一个作用域级下调C＃修改字符串数组 [英] C# modifying string array from one scope level down

问题描述

我在C＃新手，但我知道我应该能想出解决办法。我的搜索技巧没有任何给我一个直接的答案。

我有存储在字符串数组（它们已经从分割，分隔的列表）两个应用设置。

最后，我要运行code的一大块​​，在两种设置条件。

的条件是：

1. 如果阵列中存在设置1（domattributes），在各设定值code。


2. 如果设置也是在阵列2（intlattributes）存在，运行无论是包含数组中的每个设定值code 1或阵列


3. 下面就是我试图做它用if / else语句打造出来的字符串数组，但它不工作。

我得到的错误

  

名称'attributeIds'不存在于当前上下文存在

我假设这是因为字符串数组实际上是建立在if / else语句，并可能是从的foreach方法试图使用一个不同的范围。任何帮助将是AP preciated。这里的code：

 如果（！string.IsNullOrEmpty（DomAttributesSetting））
{
    如果（！string.IsNullOrEmpty（IntlAttributesSetting））
    {
        字符串[] = domattributeIds DomAttributesSetting.Split（新的char [] {'，'}，StringSplitOptions.RemoveEmptyEntries）;
        字符串[] = intlattributeIds IntlAttributesSetting.Split（新的char [] {'，'}，StringSplitOptions.RemoveEmptyEntries）;
        字符串[] = attributeIds新的字符串[domattributeIds.Length + intlattributeIds.Length];
        Array.Copy（domattributeIds，attributeIds，domattributeIds.Length）;
        Array.Copy（intlattributeIds，0，attributeIds，domattributeIds.Length，intlattributeIds.Length）;
    }
    其他
    {
        字符串[] = attributeIds DomAttributesSetting.Split（新的char [] {'，'}，StringSplitOptions.RemoveEmptyEntries）;
    }
    的foreach（在attributeIds串attributeId）
    {
        PersonAttribute personAttribute =（PersonAttribute）person.Attributes.FindByID（int.Parse（attributeId））;
        如果（personAttribute == NULL）
        {
            personAttribute =新PersonAttribute（PERSON.PERSONID，int.Parse（attributeId））;
        } ...
 

解决方案

您需要声明 attributeIds 唯一的一次，然后必须将其声明在如果语句外，这样它是对方法的其余部分是可见的。

试试这个：

 的String [] attributeIds;
如果（！string.IsNullOrEmpty（IntlAttributesSetting））
{
    字符串[] = domattributeIds DomAttributesSetting.Split（新的char [] {'，'}，StringSplitOptions.RemoveEmptyEntries）;
    字符串[] = intlattributeIds IntlAttributesSetting.Split（新的char [] {'，'}，StringSplitOptions.RemoveEmptyEntries）;
    attributeIds =新的字符串[domattributeIds.Length + intlattributeIds.Length];
    Array.Copy（domattributeIds，attributeIds，domattributeIds.Length）;
    Array.Copy（intlattributeIds，0，attributeIds，domattributeIds.Length，intlattributeIds.Length）;
}
其他
{
    attributeIds = DomAttributesSetting.Split（新的char [] {'，'}，StringSplitOptions.RemoveEmptyEntries）;
}的foreach（在attributeIds串attributeId）
{
    //等等...
}
 

I am a novice at C#, yet I know I should be able to figure this out. My searching skills have not given me a direct answer either.

I have two application settings that are stored in string arrays (they have been split from a , separated list).

Ultimately I want to run one chunk of code, conditional upon both settings.

Conditions are:

1. If settings exist in array 1 (domattributes), run the code on each setting value.
2. If settings also exist in array 2 (intlattributes), run the code on each setting value contained in either array 1 or array
3. Below is how I have tried to do it using an if/else statement to build out the string array, but it doesn't work.

I get the error

The name 'attributeIds' does not exist in the current context

I am assuming it is because the string array is actually built in the if/else statement, and is probably in a different scope from the foreach method that is trying to use it. Any help would be appreciated. Here's the code:

if (!string.IsNullOrEmpty(DomAttributesSetting))
{
    if (!string.IsNullOrEmpty(IntlAttributesSetting))
    {
        string[] domattributeIds = DomAttributesSetting.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);
        string[] intlattributeIds = IntlAttributesSetting.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);
        string[] attributeIds = new string[domattributeIds.Length + intlattributeIds.Length];
        Array.Copy(domattributeIds, attributeIds, domattributeIds.Length);
        Array.Copy(intlattributeIds, 0, attributeIds, domattributeIds.Length, intlattributeIds.Length);
    }
    else
    {
        string[] attributeIds = DomAttributesSetting.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);
    }
    foreach (string attributeId in attributeIds)
    {
        PersonAttribute personAttribute = (PersonAttribute)person.Attributes.FindByID(int.Parse(attributeId));
        if (personAttribute == null)
        {
            personAttribute = new PersonAttribute(person.PersonID, int.Parse(attributeId));
        }...

解决方案

You need to declare attributeIds only once, and it must be declared outside the if statement so that it is visible to the rest of the method.

Try this:

string[] attributeIds;
if (!string.IsNullOrEmpty(IntlAttributesSetting))
{
    string[] domattributeIds = DomAttributesSetting.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);
    string[] intlattributeIds = IntlAttributesSetting.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);
    attributeIds = new string[domattributeIds.Length + intlattributeIds.Length];
    Array.Copy(domattributeIds, attributeIds, domattributeIds.Length);
    Array.Copy(intlattributeIds, 0, attributeIds, domattributeIds.Length, intlattributeIds.Length);
}
else
{
    attributeIds = DomAttributesSetting.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);
}

foreach (string attributeId in attributeIds)
{
    // etc...
}

这篇关于从一个作用域级下调C＃修改字符串数组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IT屋！