agent-framework/dotnet/src/Microsoft.Agents.AI.Workflows.Declarative/CodeGen/Snippets/EvaluateStringExpressionTemplate.tt

<#+
void EvaluateStringExpression(StringExpression expression, string targetVariable, bool isNullable = false)
{
    string typeName = isNullable ? "string?" : "string";
    if (expression is null)
    {#>
        <#= typeName #> <#= targetVariable #> = <#= isNullable ? "null" : "string.Empty" #>;<#+ 
    }
    else if (expression.IsLiteral)
    {
        if (expression.LiteralValue.Contains("\n"))
        {#>
        <#= typeName #> <#= targetVariable #> = 
            """
            <#= expression.LiteralValue #>
            """;<#+ 
        }
        else
        {#>
        <#= typeName #> <#= targetVariable #> = <#= FormatStringValue(expression.LiteralValue) #>;<#+ 
        }
    }
    else if (expression.IsVariableReference && expression.VariableReference.SegmentCount == 2)
    {#>
        <#= typeName #> <#= targetVariable #> = await context.ReadStateAsync<string>(key: "<#= expression.VariableReference.VariableName #>", scopeName: "<#= expression.VariableReference.NamespaceAlias #>").ConfigureAwait(false);<#+
    }
    else if (expression.IsVariableReference)
    {#>
        <#= typeName #> <#= targetVariable #> = await context.EvaluateValueAsync<string>(<#= FormatStringValue(expression.VariableReference.ToString()) #>).ConfigureAwait(false);<#+ 
    }
    else
    {#>
        <#= typeName #> <#= targetVariable #> = await context.EvaluateValueAsync<string>(<#= FormatStringValue(expression.ExpressionText) #>).ConfigureAwait(false);<#+ 
    }
}
#>