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一道微分方程应用题中的“微”妙解答 首先，设导弹的位置为 (x,y) ,由简单的物理及几何知识我们可以列出以下微分方程组 然后......然后怎么解呢？ 我们发现这是一个关于 、、x、y、t 的三元微分方程组，这是符合实际的，由于 、x、y 都分别是 t 的函数，我们只需要分别解出 、x、y 关于 阅读全文
posted @ 2022-09-12 17:09
ChuckLu
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WPF binding not updating the view 回答1 You need to implement INotifyPropertyChanged in your ViewModel order to notify the View that the property has ch 阅读全文
posted @ 2022-09-09 17:18
ChuckLu
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该文被密码保护。 阅读全文
posted @ 2022-09-08 23:38
ChuckLu
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Cannot convert from an IEnumerable<T> to an ICollection<T> I have defined the following: public ICollection<Item> Items { get; set; } When I run this 阅读全文
posted @ 2022-09-08 15:24
ChuckLu
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How can I add an item to a IEnumerable<T> collection? My question as title above. For example IEnumerable<T> items = new T[]{new T("msg")}; items.ToLi 阅读全文
posted @ 2022-09-08 15:20
ChuckLu
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What are the Navigation Properties in Entity Framework 回答1 Navigation properties represents related entites to the principal entity. Foreign Keys are 阅读全文
posted @ 2022-09-08 10:27
ChuckLu
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Why Navigation Properties are virtual by default in EF I have following POCO class being used in EF 6.x. My question: Why is the navigation property o 阅读全文
posted @ 2022-09-08 10:22
ChuckLu
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Do Visual Studio Database Project *.refactorlog Files Belong in Source Control? 问题 I am using git (via GitHub for Windows) and I am using the latest . 阅读全文
posted @ 2022-09-08 09:41
ChuckLu
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数学一李永乐660 132题 分母和差化积，分子1-cosx的等价无穷小是二分之一的x^2。 https://www.symbolab.com/solver/limit-calculator/%5Clim_%7Bx%5Cto0%7D%5Cleft(%5Cfrac%7Bcos%5Cleft(sinx% 阅读全文
posted @ 2022-09-07 15:46
ChuckLu
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Is there a quick way to find all columns in SQL Server 2008 R2 that are encrypted/have encrypted data? SELECT t.name AS [Table], c.name AS [Column], c 阅读全文
posted @ 2022-09-07 14:29
ChuckLu
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