Shulou(Shulou.com)06/02 Report--

This article is to share with you about the solution to VB.NET errors, the editor thinks it is very practical, so I share it with you to learn. I hope you can get something after reading this article.

Although the structure of VB.NET is clear and the code introduction is flexible, the operation is not very simple, and all kinds of errors will be encountered in practice. So today we will introduce some solutions to VB.NET errors in detail to help you solve the problem.

While doing VB.NET development, there was a VB.NET error: "invalid conversion from string" aa "to type" Double ". This is a function that manipulates the database, but the database does not have fields of type Double, but it is strange that it throws this error.

Later, line-by-line debugging of the program found that the program was wrong in the connection of a numeric variable and a character variable, which is now simplified as follows:

Dim iTemp As Integer = 3 Dim strTemp As String = "aa" Response.Write (strTemp + iTemp)

We often write such logical statements in C #, which are as follows:

String strTemp = "aa"; int iTemp = 3; Response.Write (strTemp + iTemp)

The same program in C # does not throw this VB.NET error of "invalid conversion from string" aa "to type" Double ".

What is the difference between VB.NET and C#?

A string variable and a numeric variable are added, C # will implicitly convert the numeric variable into a character type and then connect the character type data together, but the same problem VB.NET is to convert a character type into a numeric type, in this conversion process, the system will first convert the character type and numerical type to a higher precision data type (Double). However, there will be no problem with the conversion of integer data to Double data, but there will be a problem when character data is converted to double, and the VB.NET error of "invalid conversion from string" aa "to type" Double "will be thrown.

There are concatenation operators "&" and "+" in VB.NET

+ add a connector if the two operands are String, concatenate the two operands into a string, otherwise treat them as a plus sign.

& Connector forcibly converts the operation data into String and then performs the join operation.

The above is what the solution to VB.NET error is. The editor believes that there are some knowledge points that we may see or use in our daily work. I hope you can learn more from this article. For more details, please follow the industry information channel.

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