SQL float vs. C# float: Why the Direct Assignment Fails and How to Fix It?

Delving into the Disparity Between SQL float and C# float

When retrieving values from a SQL database into a C# program, discrepancies can arise when assigning float data types between the two environments. This article aims to shed light on the differences between a SQL float and a C# float, resolving the dilemma encountered in the given scenario.

The InvalidCastExecption experienced in the code snippet stems from a mismatch in data types. In SQL, the float data type is equivalent to a double in C#, as per the documentation for SQLDbType. However, in the original attempt, the programmer tried to directly assign the SQL float value to a local variable of type C# float, which is not compatible.

To resolve this issue, the programmer took an indirect approach by converting the SQL float value to a C# double using a cast, and then converting the double to a C# float. This roundabout method works but seems unconventional.

The correct way to handle this type conversion is to cast the SQL float value directly to a C# double, as shown in the modified code below:

_AccelLimit = (double)exercise["DefaultAccelLimit"];

By understanding the data type equivalencies between SQL and C#, developers can avoid such inconsistencies and ensure seamless data transfer between the two environments.

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