General review Test (II)

Parse: Read () is the reading character! ReadLine () is the read string

Parsing: This is the difference between directory and DirectoryInfo, directory class methods are static, you can call directly, the DirectoryInfo class method is not static, so you want to instantiate the call The directory contains the exist () method, DirectoryInfo contains the exist property, and the GetFiles () method of the Directory class returns an array of file name strings under the specified directory.

Parse: The method name is the same, the parameter list is the same, the return value is the same or its subclass, the access modifier cannot be strict with the parent class. You can also define your own methods in subclasses. So select AC

Parsing: A primary goal of using indexes to fetch high performance in a relational database is to avoid full table scans, because full table scans need to read every data page of a table from disk, and if an index points to a data value, the query needs to read only a few disks at a time. Therefore, reasonable use of the index can speed up the data query. However, indexes do not always improve the performance of the system, and indexed tables require more storage space in the database, as well as the time required to delete and remove data, and to maintain the index for longer processing time. Therefore, for a table with a small amount of data, it is best not to use an index, and because there is less data, the query may take less time than traversing the index, and the index may not have an optimization effect.

Analytical:

Toggle (F1,f2,f3 ... ) Method: F1: The function to be executed the first few clicks. F2: The function to be executed when the second number of hits is clicked. FN3,FN4,...: Functions to be performed when more than once clicked

Parsing: This topic examines the structure of the Xnl file. Xnl ' nodes can be duplicated and not case-sensitive, and nodes must have start and end tags. The Nodes property in the node can only read the child nodes under the current node, and cannot go to the child nodes of all nodes. So select ad

Analytical:

In SQL Server Management Studio, a table can create a maximum of one clustered index, and a composite index may contain up to 16 fields. In SQL Server Management Studio, right-click to select the Database, table, and index that you want to manipulate, right-click to select the index you want to delete, select the Delete menu item in the pop-up menu, and perform the delete operation.

Parsing: The request object should be the GetParameter method, error 3rd, option C is correct. 1th, 2 are correct

Parsing: This topic examines the four scopes, where request corresponds to a demand, and when redirected, the data disappears. Sessions correspond to one session and do not disappear after redirection.

Parsing: Writetoend () No This method

General review Test (II)