SQL Float vs. C# Float: Why Does Direct Assignment Cause an InvalidCastException?

Understanding the Distinction between SQL Float and C# Float

When retrieving data from a database into a C# application, it is essential to comprehend the differences between data types in SQL and C#. In this case, the focus is on the nuances between SQL float and C# float.

A SQL float data type differs from a C# float data type for several reasons. Firstly, in SQL, the float data type is intended to denote double-precision floating-point numbers, whereas in C#, the float data type specifically refers to single-precision floating-point numbers.

As highlighted in the given example, assigning a SQL float value directly to a C# float variable can result in an InvalidCastException due to this difference in precision. The error occurs because the retrieved value is a double-precision value, while the C# variable expects a single-precision value.

To address this issue, a casting conversion is necessary. By casting the retrieved value to a double, which matches the precision of SQL float, and then casting that double to a float, the assignment can be made without encountering the casting exception.

This workaround may seem counterintuitive at first, but it adheres to the type system and the precision requirements of both SQL and C#. By understanding the underlying differences between data types in these languages, developers can prevent such errors and ensure seamless data handling between applications and databases.

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