Using .NET string formatting, how do I format a string to display blank (empty string) for zero (0)?
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21-09-2019 - |
문제
I am using a DataBinder.Eval expression in an ASP.NET Datagrid, but I think this question applies to String formatting in .NET in general. The customer has requested that if the value of a string is 0, it should not be displayed. I have the following hack to accomplish this:
<%# IIf(DataBinder.Eval(Container.DataItem, "MSDWhole").Trim = "0", "",
DataBinder.Eval(Container.DataItem, "MSDWhole", "{0:N0}")) %>
I would like to change the {0:N0}
formatting expression so that I can eliminate the IIf statement, but can't find anything that works.
해결책
You need to use the section separator, like this:
<%# DataBinder.Eval(Container.DataItem, "MSDWhole", "{0:N0;; }").Trim() %>
Note that only the negative section can be empty, so I need to put a space in the 0
section. (Read the documentation)
다른 팁
Given the accepted answer:
<%# DataBinder.Eval(Container.DataItem, "MSDWhole", "{0:N0;; }").Trim() %>
The a space is placed in the the 3rd position, however placing a #
in the third position will eliminate the need to call Trim()
.
<%# DataBinder.Eval(Container.DataItem, "MSDWhole", "{0:N0;;#}") %>
Use a custom method.
public static string MyFormat(double value) {
return value == 0 ? "" : value.ToString("0");
}
<%# MyFormat(Convert.ToDouble(Eval("MSDWhole"))) %>
Try to call a function while binding like this
<%# MyFunction( DataBinder.Eval(Container.DataItem, "MSDWhole") ) %>
and inside the function make the formatting you want