#事故现场: 在一个.net 4.0 的项目中使用dynamic,示例代码如下: private static void Main(string[] args) { dynamic obj; obj = new { name = "jack" }; Console.WriteLine(obj.name); } 在读取obj.name时,报错: One or more types required to compile a dynamic expression cannot be fou…
This is because dynamic keyword is a new C# keyword. So we need to import Microsoft.CSharp.dll. Here is offical document: http://msdn.microsoft.com/en-us/library/dd264736.aspx the very first sentence: " Visual C# 2010 introduces a new type, dynamic.…
SQL应用报错800.Corresponding types must be compatible in CASE expression. 错误描述: 11:00:51 [SELECT - 0 row(s), 0.000 secs] [Error Code: -800, SQL State: IX000] Corresponding types must be compatible in CASE expression. ... 1 statement(s) executed, 0 row…
[问题背景]:在Windows 10系统,pip install Scrapy,报错error: Microsoft Visual C++ 14.0 is required,还有提示Twisted需要安装. [解决方法步骤] 1.根据提示,去https://landinghub.visualstudio.com/visual-cpp-build-tools下载C++编译工具.但是,页面已经打不开,无法下载. 2.之前因需要安装uwsgi,在Windows 10 安装过MinGW,通过可以Min…
转载地址:https://blog.csdn.net/qq784515681/article/details/85070195 在新建maven项目时,Problems中报错: Error:Maven Resources Compiler: Maven project configuration required for module 'XX(项目名)' isn't available. Compilation of Maven projects is supported only if ext…
pandas-11 TypeError: ufunc 'isnan' not supported for the input types, and the inputs could not be safely错误解决方法 将一个list矩阵转化为numpy数组之后,使用np.isnan()方法,报出了这么一个错误: TypeError: ufunc 'isnan' not supported for the input types, and the inputs could not be saf…