DateFormat扩展帮助 [英] DateFormat extension help

问题描述

大家好，我已经在项目中添加了一个实体数据模型，并使用EDM中的datetime值填充了许多文本框.

Hi everyone, I''ve an entity data model added to my project and I''m populating a number of text-boxes with the datetime value from the EDM.

txtFinancialYearFrom.Text = Convert.ToString(company.FinancialYearFrom);

但我想尝试编写一个扩展方法，该方法采用该datetime值并将其重新格式化为MMMMd格式.这是我到目前为止的内容:

But I''d like to try to write an extension method that takes that datetime value and reformats it into MMMMd format. Here''s what I have so far:

namespace ExtensionLibrary
{
    //Extension methods must be defined in a static class
    public static class DateFormatExtension
    {
        // This is the extension method.
        public static String MMMMdFormat(this DateTime date)
        {
            return new String(date.ToString("d MMMM"));
        }
    }
}

在目前，这给了我2个错误:
错误1与' string.String(char [])'的最佳重载方法匹配有一些无效的参数
错误2参数1:无法从&#39; string&#39;转换为到&#39; char []&#39;</pre>

at the minute this is giving me 2 errors:
Error 1 The best overloaded method match for &#39;string.String(char[])&#39; has some invalid arguments
Error 2 Argument 1: cannot convert from &#39;string&#39; to &#39;char[]&#39;</pre>
Has anyone tried this before?

推荐答案

您需要做的就是删除新字符串"位:

All you need to do is remove the "new String" bit:

public static class MyExtensions
    {
    public static String MMMMdFormat(this DateTime date)
        {
        return date.ToString("d MMMM");
        }
    }

谢谢OriginalGriff，这就是我最后得到的结果:

thank you OriginalGriff, here''s what I have ended up with:

namespace ExtensionLibrary
{
    //Extension methods must be defined in a static class
    public static class ExtensionLibrary
    {
        //This method handles any NULLABLE Datetime fields
        public static String FormatNULLDateTime(this DateTime? date)
        {
            if (date.HasValue)
                return ((DateTime)date).ToString("dd MMMM");
            else
                return "";
        }

        //This method handles non-NULLABLE Datetime fields
        public static String FormatDatetime(this DateTime date)
        {
            return ((DateTime)date).ToString("dd MMMM");
        }
    }
}

这篇关于DateFormat扩展帮助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！