错误8无法将类型'string []'隐式转换为'int []' [英] Error 8 Cannot implicitly convert type 'string[]' to 'int[]'

问题描述

大家好，这是基于输入的字符串进行搜索的，我正在重写代码，以便可以完全相同的方式进行搜索，但是基于整数，我试图将字符串的实例更改为"int"或"int64"，但我知道它无法正常工作，值得一试，只是对如何使它读取"int ClaimID"而不是"string ClaimID"感到好奇
任何帮助将不胜感激！

Hi Guys, this does a search based on a string being input, I am rewriting the code so that i can have it do the search exactly the same way but based on an integer, i tried to change instances of string to "int" or "int64" but i know that it wouldnt work, was worth a try, just curious on how i can get it working to read "int claimID" instead of "string ClaimID"
any help would be greatly appreciated!

public string[] searchClaim(string ClaimID)
        {
            //Connect to DB
            OleDbConnection con = new OleDbConnection(connect);
            con.Open();
            try
            {
                //SQL command to slect the claim data and add to an array to pass back
                string sql = "SELECT * FROM Claim WHERE ClaimID =" + ClaimID + "";
                OleDbCommand command = new OleDbCommand(sql, con);
                OleDbDataReader reader = command.ExecuteReader();
                reader.Read();
                string[] dbResult = new String[5]; //error here when i change it to int64 instead of string
                dbResult[0] = "Success";
                dbResult[1] = reader[0].ToString(); //also errors here saying int cannot be converted to long
                dbResult[2] = reader[1].ToString(); 
                dbResult[3] = reader[2].ToString(); 
                dbResult[4] = reader[3].ToString(); 
                con.Close();
                return dbResult; //error here as well
            }
            catch
            {
                throw new Exception();
            }
            finally
            {
                // Close the connection
                if (con != null)
                {
                    con.Close();
                }
            }
        }

推荐答案

您可以通过许多不同的方式(读取数据)进行操作(例如，
1)对OleDbDataReader使用Read()方法: http://msdn.microsoft.com/en-us/library/system. data.datatable.load.aspx [ ^ ]
3)或DataSet.Load()方法: http://msdn.microsoft.com/en-us/library/yab24tfx.aspx [ ^ ]

希望对您有帮助...

第二个想法[/EDIT]
如果您确实需要使用字符串数组，请阅读有关类型转换，尤其是显式转换的更多信息.
http://www.dotnetspider.com/resources/27313-implicit-explicit-conversion- c.aspx [ ^ ]
http://msdn.microsoft.com/en-us/library/ms173105.aspx [ ^ ]
http://social.msdn.microsoft.com/论坛/en-US/csharpgeneral/thread/808ad927-385f-49c9-aace-256eefe659d7 [ http://msdn.microsoft.com/en-us/library/ms173105％28v = vs.80％29.aspx [ ^ ]

You can do it (read data) in many different ways, for example,
1) using Read() method for OleDbDataReader: http://msdn.microsoft.com/en-us/library/system.data.oledb.oledbdatareader%28v=vs.80%29.aspx#Y0[^]
2) or using DataTable.Load(OleDbDataReader) method
http://msdn.microsoft.com/en-us/library/system.data.datatable.load.aspx[^]
3) or DataSet.Load() method: http://msdn.microsoft.com/en-us/library/yab24tfx.aspx[^]

I hope it will help...

SECOND THOUGHT[/EDIT]
If you really need to use array of string, please, read more about type conversion, especially about explicit conversion.
http://www.dotnetspider.com/resources/27313-implicit-explicit-conversion-c.aspx[^]
http://msdn.microsoft.com/en-us/library/ms173105.aspx[^]
http://social.msdn.microsoft.com/forums/en-US/csharpgeneral/thread/808ad927-385f-49c9-aace-256eefe659d7[^]
http://msdn.microsoft.com/en-us/library/ms173105%28v=vs.80%29.aspx[^]

要使此功能像您认为的那样起作用，是:

To get this to work like you think it would work is:

public int[] searchClaim(string ClaimID)
        {
            //Connect to DB
            OleDbConnection con = new OleDbConnection(connect);
            con.Open();
            try
            {
                //SQL command to slect the claim data and add to an array to pass back
                string sql = "SELECT * FROM Claim WHERE ClaimID =" + ClaimID + "";
                OleDbCommand command = new OleDbCommand(sql, con);
                OleDbDataReader reader = command.ExecuteReader();
                reader.Read();
                int[] dbResult = new int[5]; 
                dbResult[0] = 1;
                dbResult[1] = reader[0];
                dbResult[2] = reader[1]; 
                dbResult[3] = reader[2]; 
                dbResult[4] = reader[3]; 
                con.Close();
                return dbResult;             }
            catch
            {
                throw new Exception();
            }
            finally
            {
                // Close the connection
                if (con != null)
                {
                    con.Close();
                }
            }
        }

看来您正在从数据库中获取int数据类型，因此您需要一个int数组而不是Int64. int！= Int64&& int！=字符串

正如losmac正确指出的那样，只有在您的数据库模式设置为int数据类型的情况下，这种方式才能工作.如果您的数据类型混合在一起，则将无法使用.

It would appear that you are getting int datatypes from your database so you need an int array not an Int64. int != Int64 && int != string

As losmac rightfully pointed out, this would only work this way IF your database schema is setup with int datatypes. If your datatypes are mixed, this will not work.

这篇关于错误8无法将类型'string []'隐式转换为'int []'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！